vtuber holidays
On certain days, you might notice many artists drawing the same theme. This can result from a more recognized holiday such as Christmas or Valentine's day. It can also be a more niche holiday that the internet community has assigned meaning, often based on wordplay in Japanese.
Below is a list of such holidays so you can prepare for them in advance, for example by commissioning art ahead of time. The common social media tags are also included.
For more niche days, see https://prtimes.jp/magazine/today/. Note that the prtimes.jp site only includes more advertiser friendly days.
January
1 - New Year
15 - Strawberry Day
#いちごの日
15 (ichi-go), ichigo means strawberry. Strawberry harvesting and shipping begins in earnest in mid-January.
19 - Good Mouth Day
#いいくちの日
The date was chosen because the combination of 1 and 19 makes 119, which can be read as "ii (11) kuchi (9)."
Art focusing on the mouth or lips.
25 - Pancake Day / Hotcake Day
#ホットケーキの日
Based on a marketing campaign by a pancake company.
Motifs are pancakes, cream and syrup.
31 - Wife's Day
#愛妻の日
The date was decided based on the wordplay of "1 (the English word "I") and "31 (wife)."
February
2 - Twintails Day (See also November 22)
#ツインテールの日
Date decided because of repeated 2-s.
Art features hairstyles with twintails.
2 - Good Couples (See also April 22, Nov 22)
#夫婦の日
3 (approx) - Setsubun Day
#節分の日
The day before the beginning of spring.
Art may feature food and clothes related to the Setsubun festival.
5 - Smile Day (See also November 25 and August 8)
#笑顔の日
The name comes from the wordplay 2 (ni) 5 (ko) Nico, which means smile in Japanese.
10 - Futon Day (Also October 10)
#ふとんの日
10 - Knit Day
#ニットの日
Artists draw characters in knit clothes, such as sweaters, scarves, and hats.
10 - Thighs Day (See also November 20)
#太ももの日
12 - Darwin's Day (Also November 24)
#ダーウィンの日
A day commemorating the birthday (February 12, 1809) of British naturalist Charles Darwin
Artists draw a series of images of something from primitive to advanced.
12 - Bra Day
#ブラジャーの日
#ブラの日
It originates from the day in 1914 (Taisho 3) when American Mary Phelps Jacob invented and applied for a patent for the prototype of the brassiere.
14 - Valentine's Day
#バレンタインデー
#バレンタイン
#ブラの日
In Japan, it is known as the day when women give chocolates to men.
17 - Day of Angel's Whispers
#天使のささやきの日
#天使の囁き記念日
On February 17, 1978, Moshiri, Horokanai-cho, Hokkaido, recorded the lowest temperature in Japan, -41.2°C.
The term "Angel's Whisper" comes from "diamond dust," which is created when water vapor in the air freezes.
18 - Good Night's Sleep Day
#安眠の日
19 - Mint Chocolate Day
#チョコミントの日
#チョコミン党
The National Chocolate Mint Day is sponsored by the US National Confectioners Association.
22 - Ninja Day
忍者の日
Based on the reading of the number 2 as "ni" in Japanese and ninjas stereotyped as making the same sound, 2/22 is Ninja Day.
22 - Cat Day
#猫の日
The date was chosen based on the mnemonic that sounds like a cat's meow, which can be read as "Nyan (2), Nyan (2), Nyan (2)."
26 - Wrapping Day
#包むの日
#ラッピングの日
The date is derived from the wordplay of "tsutsumu" (wrapping), which is read as "tsu (2) tsu (2) mu (6)."
Art can depict characters wrapped in ribbons.
27 - Pokemon Day
#ポケモンの日
#PokemonDay
On February 27, 1996, Nintendo Co., Ltd. released the video game "Pocket Monsters Red and Green."
March
3 - Ear Day
#耳の日
#みみの日
#ミミの日
The date was decided based on the play on words "mi (3) mi (3)." In Japanese, mimi means ears.
Art often includes characters with animal ears. For vtubers who already have animal ears, it might show them wearing an outfit with different animal ears, for example, a bunny suit with fake bunny ears.
3 - Rabbit Day
#うさぎの日
Characters depicted with rabbits or wearing bunny ears or bunny suits.
7 - Sauna Day
#サウナの日
The date is a play on words that reads "sa (3) una (7)."
This day appears to be similar to but less popular than November 26 (Good Bath Day) in the vtuber community.
7 - Thank You Day
#ありがとうの日
The date of the anniversary comes from the mnemonic that "thank you" is read as "san (3) kyu (9)" in English.
12 - Size Day
#サイズの日
Based on the wordplay on the Japanese pronunciation of "sa (3) is (12)."
Art features size differences, gigantification/minification, clothes sizes.
14 - Oppai Day
#パイの日
Possibly derived from pronouncing 3/14 as "pai pai", which may be another word for oppai.
Artwork focuses on breasts.
14 - White Day
#WhiteDay
#ホワイトデー
Japanese day similar to valentine's day. A day to return the Valentine's Day gifts. On white day, men give gifts to women.
21 - Randoseru Day / School Backpack Day / School Bag Day
#ランドセルの日
Established by the creators of mini school bags, the date was chosen because it is graduation season and because 3 + 2 + 1 = 6 means "thank you" for the past six years.
Artists may draw vtubers with elementary school backpacks.
21 - Hypnosis Day
#催眠術の日
The name comes from the hypnotism call "3, 2, 1".
27 - Cherry Blossom Day / Sakura Day
#さくらの日
The date was decided because it is the time when cherry blossoms begin to bloom.
Late March through April - Easter
#イースター
#Easter
#HappyEaster
It is not a very familiar holiday for Japanese people.
April
1 - April Fools
A day to play pranks on others. Vtubers who make posts as pranks often will not tag them. Remember to be skeptical on this day.
17 - Dinosaur Day
#恐竜の日
The date was chosen to commemorate the discovery of fossilized dinosaur eggs.
22 - Couples' Day (Also February 2, November 22)
#よい夫婦の日
29 - Towel Day
#タオルの日
The date, 4 and 29, is a play on words that means to wipe well (4) with a towel (29).
A good day for artists to draw vtubers in towels.
May
Second Sunday of May - Mother's Day
#母の日
It became customary to give carnations as a symbol of maternal love on Mother's Day every year.
12 - Nurse Day
#看護の日
The date is in honor of the birthday of Florence Nightingale, a pioneer of modern nursing.
Art can feature nurse uniforms.
13 - Dog Day
#愛犬の日
May 13th "Dog Day" is unique to Japan, while August 26th is "National Dog Day" overseas.
15 - Stocking Day
#ストッキングの日
On this day in 1940, the American company DuPont launched nylon stockings.
Artists might draw vtubers wearing stockings.
23 - Kiss Day
#キスの日
This day in 1946 (Showa 21) marks the release of the film "Hatachi no Seishun," the first kissing scene to be filmed in Japan.
A day for vtubers to offer or receive kisses if so inclined, and a day when artists might draw kisses.
23 - Love Letter Day
#恋文の日
#ラブレターの日
The date is derived from the wordplay "ko (5) ibu (2) mi (3)"
Vtubers may use love letter assets today.
25 - Pudding Day
#プリンの日
Established by a dairy product manufacturer, designated as a play on the word "nikkori = 25" (smile) in the hopes that people would smile when they eat pudding.
Vtubers may use pudding assets today.
29 - Kimono Day
#呉服の日
The date is a play on words, "go (5) fuku (2) ku (9)."
June
1 - Milk Day
#牛乳の日
A good day for well-endowed vtubers and those who want to drink milk.
6 - Sheep Day
#ひつじの日
The date was chosen because the number "6" looks like a curled up sheep's horn, and is located on the left and right, so this day with two "6s" lined up was chosen as a commemorative day.
11 - Umbrella Day
#傘の日
This day corresponds to the beginning of the rainy season.
Good for art containing umbrellas and rain.
12 - Lover's Day
#恋人の日
In the Sao Paulo region of Brazil, June 12th is the day before the death anniversary of Saint Anthony, the patron saint of women and the god of matchmaking, and is widely known as Lovers' Day. On this day, it is customary for families and couples to put photos in photo frames and exchange them.
Third Sunday in June - Father's Day
#父の日
This day corresponds to the beginning of the rainy season.
Good for vtubers who roleplay about fathers.
26 - Open Air Bath Day
#露天風呂の日
The date comes from the play on words "ro (6) ten (・) bu (2) ro (6)."
28 - Parfait Day
#パフェの日
July
3 - Soft-Serve Ice Cream Day
#ソフトクリームの日
A good day for ice cream assets.
5 - Bikini Day / Bikini Style Day
#ビキニの日
#ビキニスタイルの日
On this day in 1946 (Showa 21), the French Louis Reard introduced the world's first bikini-style swimsuit. The bikini-style swimsuit is a separate type of swimsuit consisting of a bra-like top and short pants, and was introduced as "the tiniest swimsuit ever."
7 - Ponytail Day
#ポニーテールの日
The date was chosen as July 7th, which is Tanabata and Yukata Day, because her profile with her ponytail looks like a row of sevens (77) and because a ponytail goes well with a yukata.
7 - Tanabata
#七夕
Tanabata is a summer event familiar to Japanese people from childhood. It has themes of summer, the night sky, stars, and lovers.
11 - Ramen Day
#ラーメンの日
The number 7 resembles a soup spoon and the number 11 resembles chopsticks
14 - Sunflower Day
#ひまわりの日
Third Monday of July - Marine Day
#海の日
20 - Hamburger Day
#ハンバーガーの日
31 - Beach Day
#ビーチの日
The date was chosen because it is a play on words, "7 (na) 3 (mi) no 1 (ii) day," as the sand on the beach is formed and purified by the waves, and because it is the middle day between "Umi no Hi" (Marine Day) and "Mountain Day."
31 - Boob Day (or is it August 1?)
#ぺぇの日
August
8 - Underwear Day / Panties Day
#パンツの日
8 (pan), 2 (two, sounds like tsu), and underwear are called pantsu in Japanese.
8 - Smile Memorial Day (See also February 5 and November 25)
#笑いの日
#スマイル記念日
Based on the wordplay "ha (8) ha (8) ha (8)", the sound of laughter.
Early August??? - Oppai Day - #おっぱいの日
21? 27? ??? - Bunny Day
#バニーの日
Bunny Suits
September
???Another Bunny Day?
October
10 - Futon Day (Also February 10)
#ふとんの日
29 - Kimono Day (See also November 15)
#和服の日
The date is derived from the wordplay that reads "ii (1) wa (0) fu (2) ku (9)." The purpose of establishing the anniversary is to spread the name of "wafuku," a unique Japanese costume, and to let many people know the unique beauty of wafuku.
For vtuber art, this is the more prominent Kimono Day compared to 15 November.
31 - Halloween
November
November is full of "good ○○" days. See as reference https://x.com/MisakiPrimrose/status/794758649977548800/photo/1
1 - Dog Day
#犬の日
It was established based on the sound of a dog barking, "Wan Wan Wan."
2 - Tights Day
#いいタイツの日
#タイツの日
The tights are knitted one leg at a time and then sewn together. The number 11 is a pair of 11 pairs, so the number was established.
3 - Good Birth Day
#いいお産の日
11 (good), 03 (osan, giving birth)
4 - Nice Butt Day
#いいお尻の日 / #いいおしりの日
11 (good) 04 (buttocks) is a play on words. The first of three "nice butt" days in November.
4 - Good Oshi Day
#いい推しの日
11 (good), 04 (oshi) (When is this tag used?)
5 - Good Man's Day
#いい男の日
It is a play on words of 11 (good) and 05 (man). It was established by Shiseido. By the way, Good Woman Day is November 7th (good woman).
5 - Matchmaking Day
#縁結びの日
Based on wordplay. Shrines around the country that worship the god of matchmaking sometimes hold events to coincide with Matchmaking Day. Art on this day can feature the red thread of fate.
7 - Good Tummy Day
#いいおなかの日
#いい推しの日
11 (good) 07 (belly)
7 - Good Woman's Day
#いい女の日
11 (good) 07 (onna, woman)
8 - Nice Breasts Day
#いいおっぱいの日
A play on words between 11 (good) and 08 (boobs).
9 - 119 Day
#119番の日
Established by the Fire and Disaster Management Agency in 1987, named after the emergency call number 119 for firefighting.
Artists can draw cosplay of public crisis workers, such as firefighters and nurses.
10 - Toilet Day
#トイレの日
A play on words of 11 (ii) and 10 (toilet). Established by the Japan Toilet Association in 1986.
11 - Pocky Day
#PockyDay
#ポッキーの日
#ポッキの日 (possibly a misspelling?)
The origin of the name is that the number 1 looks like a Pocky.
12 - Good Hips Day
#いいヒップの日
A pun on 11 (nice) and 12 (hip). The second Butt Day in November!
13 - Good Knee Day
#いいひざの日
#いい膝の日
A play on words of 11 (good) and 13 (knee). Established by Zeria Pharmaceuticals.
15 - Kimono Day (See also October 29)
#きものの日
The date was chosen because November 15th is the day of the Shichi-Go-San festival, a day when children look good in kimono.
For vtuber art, this is the less popular Kimono Day compared to 29 October.
16 - Good Color Day
#いいいろの日
#いい色の日
A play on words: 11 (good) and 16 (color)
17 - Japanese Underwear Day / Nice Underwear Day
#日本製肌着の日
#いいインナーの日
A play on words for 11 (two lines = Japan) and 17 (inner), or 11 (nice) and 17 (inner)
19 - Good Breath Day
#いい息の日
The play on words is 11 (ii) and 19 (iki)
Art focuses on breath
19 - Good Parenting Day / Family Day
#いい育児の日
#家族の日
20 - Fur Day
#毛皮の日
A play on words: 11 (ii, good) 20 (fua, fur)
Art might feature small animals, furries, and fur coats
20 - Good Thighs Day (See also February 10)
#いい太ももの日
#いいふとももの日
#いいふとともの日
A day to appreciate thighs.
22 - Good Couples Day (See also February 2, April 22)
#いい夫婦の日
#良い夫婦の日
It is a play on words of 11 (ii) and 22 (fuufu, couple). It is a widely known anniversary, and many people register their marriage on this day.
22 - Good Twintails Day (See also February 2)
11 (good), 22 (two for the twin tails)
#いいツインテールの日
24 - Evolutionary Day (Also February 12)
#進化の日
The first edition of Darwin's "Origin of Species," which sparked the theory of biological evolution, was published on this day in 1859.
Good Smile Day (See also February 5 and August 8)
#いいえがおの日
The date is derived from the wordplay of "nikori" (a good smile) which is read as "ii (1) i (1), nikkori (2) ri (5)".
26 - Good Bath Day
#いい風呂の日
#いいおふろの日
The play on words is 11 (ii) and 26 (furo, bath).
28 - Good Knee-high Day
#いいニーハイの日
A play on words between 11 (good) and 28 (knee-high).
While not technically "Good Thighs Day", art focusing on knee-highs often also highlights the thighs.
29 - Good Meat Day / Good Muscles Day
#いいにくの日
#いい肉の日
It is a play on words of 11 (good) and 29 (niku, meat).
Art this day can focus on muscles, or on areas of the body such as the thighs or breasts, or on food meat.
30 - Good Butt Day
#いいおしりの日
#いいお尻の日
The last day of November was considered to be "Butt Day". The third "Butt Day" in November!
December
25 - Christmas
Below is a list of such holidays so you can prepare for them in advance, for example by commissioning art ahead of time. The common social media tags are also included.
For more niche days, see https://prtimes.jp/magazine/today/. Note that the prtimes.jp site only includes more advertiser friendly days.
January
1 - New Year
15 - Strawberry Day
#いちごの日
15 (ichi-go), ichigo means strawberry. Strawberry harvesting and shipping begins in earnest in mid-January.
19 - Good Mouth Day
#いいくちの日
The date was chosen because the combination of 1 and 19 makes 119, which can be read as "ii (11) kuchi (9)."
Art focusing on the mouth or lips.
25 - Pancake Day / Hotcake Day
#ホットケーキの日
Based on a marketing campaign by a pancake company.
Motifs are pancakes, cream and syrup.
31 - Wife's Day
#愛妻の日
The date was decided based on the wordplay of "1 (the English word "I") and "31 (wife)."
February
2 - Twintails Day (See also November 22)
#ツインテールの日
Date decided because of repeated 2-s.
Art features hairstyles with twintails.
2 - Good Couples (See also April 22, Nov 22)
#夫婦の日
3 (approx) - Setsubun Day
#節分の日
The day before the beginning of spring.
Art may feature food and clothes related to the Setsubun festival.
5 - Smile Day (See also November 25 and August 8)
#笑顔の日
The name comes from the wordplay 2 (ni) 5 (ko) Nico, which means smile in Japanese.
10 - Futon Day (Also October 10)
#ふとんの日
10 - Knit Day
#ニットの日
Artists draw characters in knit clothes, such as sweaters, scarves, and hats.
10 - Thighs Day (See also November 20)
#太ももの日
12 - Darwin's Day (Also November 24)
#ダーウィンの日
A day commemorating the birthday (February 12, 1809) of British naturalist Charles Darwin
Artists draw a series of images of something from primitive to advanced.
12 - Bra Day
#ブラジャーの日
#ブラの日
It originates from the day in 1914 (Taisho 3) when American Mary Phelps Jacob invented and applied for a patent for the prototype of the brassiere.
14 - Valentine's Day
#バレンタインデー
#バレンタイン
#ブラの日
In Japan, it is known as the day when women give chocolates to men.
17 - Day of Angel's Whispers
#天使のささやきの日
#天使の囁き記念日
On February 17, 1978, Moshiri, Horokanai-cho, Hokkaido, recorded the lowest temperature in Japan, -41.2°C.
The term "Angel's Whisper" comes from "diamond dust," which is created when water vapor in the air freezes.
18 - Good Night's Sleep Day
#安眠の日
19 - Mint Chocolate Day
#チョコミントの日
#チョコミン党
The National Chocolate Mint Day is sponsored by the US National Confectioners Association.
22 - Ninja Day
忍者の日
Based on the reading of the number 2 as "ni" in Japanese and ninjas stereotyped as making the same sound, 2/22 is Ninja Day.
22 - Cat Day
#猫の日
The date was chosen based on the mnemonic that sounds like a cat's meow, which can be read as "Nyan (2), Nyan (2), Nyan (2)."
26 - Wrapping Day
#包むの日
#ラッピングの日
The date is derived from the wordplay of "tsutsumu" (wrapping), which is read as "tsu (2) tsu (2) mu (6)."
Art can depict characters wrapped in ribbons.
27 - Pokemon Day
#ポケモンの日
#PokemonDay
On February 27, 1996, Nintendo Co., Ltd. released the video game "Pocket Monsters Red and Green."
March
3 - Ear Day
#耳の日
#みみの日
#ミミの日
The date was decided based on the play on words "mi (3) mi (3)." In Japanese, mimi means ears.
Art often includes characters with animal ears. For vtubers who already have animal ears, it might show them wearing an outfit with different animal ears, for example, a bunny suit with fake bunny ears.
3 - Rabbit Day
#うさぎの日
Characters depicted with rabbits or wearing bunny ears or bunny suits.
7 - Sauna Day
#サウナの日
The date is a play on words that reads "sa (3) una (7)."
This day appears to be similar to but less popular than November 26 (Good Bath Day) in the vtuber community.
7 - Thank You Day
#ありがとうの日
The date of the anniversary comes from the mnemonic that "thank you" is read as "san (3) kyu (9)" in English.
12 - Size Day
#サイズの日
Based on the wordplay on the Japanese pronunciation of "sa (3) is (12)."
Art features size differences, gigantification/minification, clothes sizes.
14 - Oppai Day
#パイの日
Possibly derived from pronouncing 3/14 as "pai pai", which may be another word for oppai.
Artwork focuses on breasts.
14 - White Day
#WhiteDay
#ホワイトデー
Japanese day similar to valentine's day. A day to return the Valentine's Day gifts. On white day, men give gifts to women.
21 - Randoseru Day / School Backpack Day / School Bag Day
#ランドセルの日
Established by the creators of mini school bags, the date was chosen because it is graduation season and because 3 + 2 + 1 = 6 means "thank you" for the past six years.
Artists may draw vtubers with elementary school backpacks.
21 - Hypnosis Day
#催眠術の日
The name comes from the hypnotism call "3, 2, 1".
27 - Cherry Blossom Day / Sakura Day
#さくらの日
The date was decided because it is the time when cherry blossoms begin to bloom.
Late March through April - Easter
#イースター
#Easter
#HappyEaster
It is not a very familiar holiday for Japanese people.
April
1 - April Fools
A day to play pranks on others. Vtubers who make posts as pranks often will not tag them. Remember to be skeptical on this day.
17 - Dinosaur Day
#恐竜の日
The date was chosen to commemorate the discovery of fossilized dinosaur eggs.
22 - Couples' Day (Also February 2, November 22)
#よい夫婦の日
29 - Towel Day
#タオルの日
The date, 4 and 29, is a play on words that means to wipe well (4) with a towel (29).
A good day for artists to draw vtubers in towels.
May
Second Sunday of May - Mother's Day
#母の日
It became customary to give carnations as a symbol of maternal love on Mother's Day every year.
12 - Nurse Day
#看護の日
The date is in honor of the birthday of Florence Nightingale, a pioneer of modern nursing.
Art can feature nurse uniforms.
13 - Dog Day
#愛犬の日
May 13th "Dog Day" is unique to Japan, while August 26th is "National Dog Day" overseas.
15 - Stocking Day
#ストッキングの日
On this day in 1940, the American company DuPont launched nylon stockings.
Artists might draw vtubers wearing stockings.
23 - Kiss Day
#キスの日
This day in 1946 (Showa 21) marks the release of the film "Hatachi no Seishun," the first kissing scene to be filmed in Japan.
A day for vtubers to offer or receive kisses if so inclined, and a day when artists might draw kisses.
23 - Love Letter Day
#恋文の日
#ラブレターの日
The date is derived from the wordplay "ko (5) ibu (2) mi (3)"
Vtubers may use love letter assets today.
25 - Pudding Day
#プリンの日
Established by a dairy product manufacturer, designated as a play on the word "nikkori = 25" (smile) in the hopes that people would smile when they eat pudding.
Vtubers may use pudding assets today.
29 - Kimono Day
#呉服の日
The date is a play on words, "go (5) fuku (2) ku (9)."
June
1 - Milk Day
#牛乳の日
A good day for well-endowed vtubers and those who want to drink milk.
6 - Sheep Day
#ひつじの日
The date was chosen because the number "6" looks like a curled up sheep's horn, and is located on the left and right, so this day with two "6s" lined up was chosen as a commemorative day.
11 - Umbrella Day
#傘の日
This day corresponds to the beginning of the rainy season.
Good for art containing umbrellas and rain.
12 - Lover's Day
#恋人の日
In the Sao Paulo region of Brazil, June 12th is the day before the death anniversary of Saint Anthony, the patron saint of women and the god of matchmaking, and is widely known as Lovers' Day. On this day, it is customary for families and couples to put photos in photo frames and exchange them.
Third Sunday in June - Father's Day
#父の日
This day corresponds to the beginning of the rainy season.
Good for vtubers who roleplay about fathers.
26 - Open Air Bath Day
#露天風呂の日
The date comes from the play on words "ro (6) ten (・) bu (2) ro (6)."
28 - Parfait Day
#パフェの日
July
3 - Soft-Serve Ice Cream Day
#ソフトクリームの日
A good day for ice cream assets.
5 - Bikini Day / Bikini Style Day
#ビキニの日
#ビキニスタイルの日
On this day in 1946 (Showa 21), the French Louis Reard introduced the world's first bikini-style swimsuit. The bikini-style swimsuit is a separate type of swimsuit consisting of a bra-like top and short pants, and was introduced as "the tiniest swimsuit ever."
7 - Ponytail Day
#ポニーテールの日
The date was chosen as July 7th, which is Tanabata and Yukata Day, because her profile with her ponytail looks like a row of sevens (77) and because a ponytail goes well with a yukata.
7 - Tanabata
#七夕
Tanabata is a summer event familiar to Japanese people from childhood. It has themes of summer, the night sky, stars, and lovers.
11 - Ramen Day
#ラーメンの日
The number 7 resembles a soup spoon and the number 11 resembles chopsticks
14 - Sunflower Day
#ひまわりの日
Third Monday of July - Marine Day
#海の日
20 - Hamburger Day
#ハンバーガーの日
31 - Beach Day
#ビーチの日
The date was chosen because it is a play on words, "7 (na) 3 (mi) no 1 (ii) day," as the sand on the beach is formed and purified by the waves, and because it is the middle day between "Umi no Hi" (Marine Day) and "Mountain Day."
31 - Boob Day (or is it August 1?)
#ぺぇの日
August
8 - Underwear Day / Panties Day
#パンツの日
8 (pan), 2 (two, sounds like tsu), and underwear are called pantsu in Japanese.
8 - Smile Memorial Day (See also February 5 and November 25)
#笑いの日
#スマイル記念日
Based on the wordplay "ha (8) ha (8) ha (8)", the sound of laughter.
Early August??? - Oppai Day - #おっぱいの日
21? 27? ??? - Bunny Day
#バニーの日
Bunny Suits
September
???Another Bunny Day?
October
10 - Futon Day (Also February 10)
#ふとんの日
29 - Kimono Day (See also November 15)
#和服の日
The date is derived from the wordplay that reads "ii (1) wa (0) fu (2) ku (9)." The purpose of establishing the anniversary is to spread the name of "wafuku," a unique Japanese costume, and to let many people know the unique beauty of wafuku.
For vtuber art, this is the more prominent Kimono Day compared to 15 November.
31 - Halloween
November
November is full of "good ○○" days. See as reference https://x.com/MisakiPrimrose/status/794758649977548800/photo/1
1 - Dog Day
#犬の日
It was established based on the sound of a dog barking, "Wan Wan Wan."
2 - Tights Day
#いいタイツの日
#タイツの日
The tights are knitted one leg at a time and then sewn together. The number 11 is a pair of 11 pairs, so the number was established.
3 - Good Birth Day
#いいお産の日
11 (good), 03 (osan, giving birth)
4 - Nice Butt Day
#いいお尻の日 / #いいおしりの日
11 (good) 04 (buttocks) is a play on words. The first of three "nice butt" days in November.
4 - Good Oshi Day
#いい推しの日
11 (good), 04 (oshi) (When is this tag used?)
5 - Good Man's Day
#いい男の日
It is a play on words of 11 (good) and 05 (man). It was established by Shiseido. By the way, Good Woman Day is November 7th (good woman).
5 - Matchmaking Day
#縁結びの日
Based on wordplay. Shrines around the country that worship the god of matchmaking sometimes hold events to coincide with Matchmaking Day. Art on this day can feature the red thread of fate.
7 - Good Tummy Day
#いいおなかの日
#いい推しの日
11 (good) 07 (belly)
7 - Good Woman's Day
#いい女の日
11 (good) 07 (onna, woman)
8 - Nice Breasts Day
#いいおっぱいの日
A play on words between 11 (good) and 08 (boobs).
9 - 119 Day
#119番の日
Established by the Fire and Disaster Management Agency in 1987, named after the emergency call number 119 for firefighting.
Artists can draw cosplay of public crisis workers, such as firefighters and nurses.
10 - Toilet Day
#トイレの日
A play on words of 11 (ii) and 10 (toilet). Established by the Japan Toilet Association in 1986.
11 - Pocky Day
#PockyDay
#ポッキーの日
#ポッキの日 (possibly a misspelling?)
The origin of the name is that the number 1 looks like a Pocky.
12 - Good Hips Day
#いいヒップの日
A pun on 11 (nice) and 12 (hip). The second Butt Day in November!
13 - Good Knee Day
#いいひざの日
#いい膝の日
A play on words of 11 (good) and 13 (knee). Established by Zeria Pharmaceuticals.
15 - Kimono Day (See also October 29)
#きものの日
The date was chosen because November 15th is the day of the Shichi-Go-San festival, a day when children look good in kimono.
For vtuber art, this is the less popular Kimono Day compared to 29 October.
16 - Good Color Day
#いいいろの日
#いい色の日
A play on words: 11 (good) and 16 (color)
17 - Japanese Underwear Day / Nice Underwear Day
#日本製肌着の日
#いいインナーの日
A play on words for 11 (two lines = Japan) and 17 (inner), or 11 (nice) and 17 (inner)
19 - Good Breath Day
#いい息の日
The play on words is 11 (ii) and 19 (iki)
Art focuses on breath
19 - Good Parenting Day / Family Day
#いい育児の日
#家族の日
20 - Fur Day
#毛皮の日
A play on words: 11 (ii, good) 20 (fua, fur)
Art might feature small animals, furries, and fur coats
20 - Good Thighs Day (See also February 10)
#いい太ももの日
#いいふとももの日
#いいふとともの日
A day to appreciate thighs.
22 - Good Couples Day (See also February 2, April 22)
#いい夫婦の日
#良い夫婦の日
It is a play on words of 11 (ii) and 22 (fuufu, couple). It is a widely known anniversary, and many people register their marriage on this day.
22 - Good Twintails Day (See also February 2)
11 (good), 22 (two for the twin tails)
#いいツインテールの日
24 - Evolutionary Day (Also February 12)
#進化の日
The first edition of Darwin's "Origin of Species," which sparked the theory of biological evolution, was published on this day in 1859.
Good Smile Day (See also February 5 and August 8)
#いいえがおの日
The date is derived from the wordplay of "nikori" (a good smile) which is read as "ii (1) i (1), nikkori (2) ri (5)".
26 - Good Bath Day
#いい風呂の日
#いいおふろの日
The play on words is 11 (ii) and 26 (furo, bath).
28 - Good Knee-high Day
#いいニーハイの日
A play on words between 11 (good) and 28 (knee-high).
While not technically "Good Thighs Day", art focusing on knee-highs often also highlights the thighs.
29 - Good Meat Day / Good Muscles Day
#いいにくの日
#いい肉の日
It is a play on words of 11 (good) and 29 (niku, meat).
Art this day can focus on muscles, or on areas of the body such as the thighs or breasts, or on food meat.
30 - Good Butt Day
#いいおしりの日
#いいお尻の日
The last day of November was considered to be "Butt Day". The third "Butt Day" in November!
December
25 - Christmas