Bevy of busty beauties from the modeling and cosplay worlds take part in pun-based festivities.
Despite widespread popularity stretching back generations, puns and breasts are often relegated to dirty-pleasure status in many modern societies. Japan, though, remains steadfastly unabashed in its appreciation for a turn of phrase or bounce of chest, and those passions dovetailed on November 8.
Written numerically, November 8 becomes 11-8, or 11-08, if you want to use all possible digits. In Japanese, “1” can be read as i and “8” as ppai. And while it’s not an indigenous reading, you could fudge the rules a bit and read “0” as o, due to its similarity to between-N-and-P letter of the alphabet. Once you’re done jumping through all those hoops, you end up with 11-08 becoming “ii oppai, which just so happens to be how you say “nice boobs” in Japanese.
The logic was sound enough for Japanese Twitter users, and so November 8 has become Nice Boobs Day in Japanese online circles, with gravure swimsuit models kicking off the festivities with shared snapshots.
▼ Social media–savvy Jun Amaki, always ready to leap into online trends
https://twitter.com/jun_amaki/status/928102982662496256いいおっぱいの日#1mmでもいいなと思ったらRT#二次元ボディ#いいおっぱいの日 pic.twitter.com/lx0XNnphSf
— 天木じゅん (@jun_amaki) November 8, 2017
▼ Idol singer Erina Kamiya, whose breasts were last seen attempting to shatter roof tiles, karate chop-style
https://twitter.com/kamiya__erina/status/928209164957925376▼ Saki Yanase, the woman with the Pokémon chest
Speaking of Japanese animation, November 8 was also a busy day for cosplayers, who marked the occasion by posing in in low-cut anime and anime-inspired outfits.
(* ॑꒳ ॑* )#いいおっぱいの日#おっぱい揉むテンプレ
— 伊織もえ (@iorimoe_five) November 8, 2017
コラボ! pic.twitter.com/PjlT4Eb6i6
▼ Super Sonico is an obvious choice for Ii Oppai Day
https://twitter.com/HzakiK/status/928225741229002752▼ Fate/Extra’s foxy Caster
https://twitter.com/AkaneA01/status/928284629970206720Some cosplayers couldn’t decide on a single set of clothing to represent the day, instead opting to post collages.
https://twitter.com/cm_anzu/status/928198894848155649コスプレver
— 火将ロシエル (@Kasyou3roshieru) November 8, 2017
#いいおっぱいの日 pic.twitter.com/THURz3yQ3Y
Alternatively, some contributors chose to take the focus off their apparel with extreme close-ups.
1108(良いおっぱい)の日と聞いて過去画#いいおっぱいの日 pic.twitter.com/K1le0QbRct
— るしあ (@rusia_nico) November 8, 2017
#いいおっぱいの日
— まむ🕸 (@mamu12mamu) November 8, 2017
上乳と下乳
まだあった!
おやすみ💤 pic.twitter.com/obQ2ZpWufD
Due to its linguistic origins, Ii Oppai Day was mainly celebrated by Japanese models, including Tsubura and extra-tan Rina Hashimoto, the so-called “Black Diamond” of the Japanese gravure industry.
https://twitter.com/rnrn_04/status/928259064521400321#いいおっぱいの日
— 橋本 梨菜 (@rinasketch) November 8, 2017
なつのおっぱい pic.twitter.com/LhU2wseVQp
But the hashtag managed to transcend national borders as even some overseas cosplayers got in on the act.
https://twitter.com/KimbearIi/status/928425711521611776Posting one more Dangerous Beast photo for good gacha luck! 🎃#FGO #FateGO #いいおっぱいの日 pic.twitter.com/2Ub2e4yO43
— bunnie♡王女 (@bunnie_hime) November 8, 2017
because it's #いいおっぱいの日 that's why!!
— Devin 🍉 (@runDEVINrun) November 9, 2017
here repping the modest but boobiemagic crew
📸1: @MartinWongPhoto
📸2: Rale Photography pic.twitter.com/eL97hUV50R
Finally, if all this has you feeling a little overheated and you’d like to cool off, here’s illustrated character Penpen the Emperor Penguin’s take on Nice Boobs Day.
11/8日は いいおっぱいの日#penguin #ペンギン #エンペラーペンギン #今日は何の日 #いいおっぱいの日 pic.twitter.com/zASYrCRvkq
— 皇帝ペンギンのペンペン (@penguin259) November 8, 2017
Or if the origin and visuals of Ii Oppai Day have merely whet your appetite, you can enjoy a second helping of breasts and linguistics here.
Source: Hachima Kiko
Featured image: Twitter/@HzakiK

Japanese models and Internet users celebrate Twintail Day 2017【Photos】
Japanese swimsuit models and cosplayers celebrate Bikini Day 2017【Photos】
Busty Japanese model Jun Amaki shows off her fidget/boob spinner skills【Videos】
Japanese cosplayers and models celebrate Nice Knee-High Socks Day 2016【Photos】
Tokyo’s first “breast slash” cafe is opening soon
Nine amazing off-the-beaten-path cherry blossom spots in Japan for yaezakura and shidarezakura
Studio Ghibli adds new anime tumblers to its cool streetwear brand in Japan
Japanese onsen egg maker from 100-yen store Daiso needs to be on your shopping list
Starbucks Japan releases new My Fruit³ Frappuccino at only 34 stores around the country
Mister Donut wows matcha lovers in Japan with new Dora Matcha doughnuts
Godiva now makes tofu in Japan, and sakura chocolate tofu too![Taste test]
Umamusume food and drinks dash into real world at Family Mart convenience stores[Taste test]
Universal Studios’ Sailor Moon theme park attraction is finally coming to America
Akiba Dental Clinic: The Akihabara dentist where a moe maid in cosplay cleans your teeth
Who is this mysterious large man who’s suddenly showing up on giant signs in Japan?
Train station platform ramen store closes its doors on half a century of history in Tokyo
Cherry blossoms begin blooming in Japan with record-early starts for sakura season
Studio Ghibli adds new Mother’s Day gift sets to its anime collection in Japan
Virtual idol Hatsune Miku redesigned with look that adds new elements and brings back old ones
The next time you’re feeling stressed out, you could relax on a Pokémon Psyduck chair from Japan
Komachi Shokudo: Japanese mum’s-style cooking for breakfast, lunch and dinner in Tokyo
Tokyo government organizes food truck event to clear out delinquent/homeless teen gathering area
When will the cherry blossoms reach full bloom in Japan this year?[Forecast]
Starbucks Japan unveils new sakura cherry blossom collection for hanami season 2026
Studio Ghibli releases Catbus pullback keychain that runs like the anime character
The 10 most annoying things foreign tourists do on Japanese trains, according to locals
Nine great places to see spring flowers in Japan, as chosen by travelers (with almost no sakura)
Starbucks Japan releases first-ever Hinamatsuri Girls’ Day Frappuccino
Japan’s cherry blossom season predicted to start earlier than we’d thought, especially in Tokyo
Survey asks foreign tourists what bothered them in Japan, more than half gave same answer
Japan’s human washing machines will go on sale to general public, demos to be held in Tokyo
Starbucks Japan releases new drinkware and goods for Valentine’s Day
We deeply regret going into this tunnel on our walk in the mountains of Japan
Studio Ghibli releases Kodama forest spirits from Princess Mononoke to light up your home
Starbucks Japan releases new sakura goods and drinkware for cherry blossom season 2026
Japan’s newest Shinkansen has no seats…or passengers [Video]
Major Japanese hotel chain says reservations via overseas booking sites may not be valid
Put sesame oil in your coffee? Japanese maker says it’s the best way to start your day【Taste test】
No more using real katana for tourism activities, Japan’s National Police Agency says
Busty cosplay: The quickest way to revive interest in a completed anime series 【Photos】
POOP: Pen Oppai (Breast) Oppai Pen conceived online 【Video】
Busty cosplayer makes Japanese dreams come true with super real Super Sonico cosplay 【Photos】
Cosplayers and models share selfies to celebrate Bikini Day in Japan
Famous manga artist gives out advice on how to draw breasts to celebrate Boob Day
Weekly Playboy Japan celebrates its 50th anniversary with a 50-model bikini photo shoot 【Video】
Japanese company puts up signs banning one specific style of intercourse, for coronavirus safety
Japanese gravure idol has a fishy secret to share in her bathroom 【Photos】