So let’s talk about breasts. From a statistical and linguistic standpoint, of course.
Lingerie manufacturer Triumph has released its data regarding bra cup sizes of women in Japan. While this is obviously vital internal information for running a company that produces and sells intimate apparel for women, we’re not exactly sure of the benefits of releasing it to the general public, where it will undoubtedly garner the most attention from men, a demographic with no personal need for Triumph’s products.
Nevertheless, Triumph shared with us, and so now we’re here to share their findings with you. Note that cup sizes in Japan tend to be slightly smaller than their counterparts with the same designation in America. We mention this in the interest of full exposure…uh, we mean disclosure.
Since men already spend so much time thinking about breasts, our staff doctors have informed us it would be dangerous to deliberately draw the focus of our male readers even more to them without simultaneously doing something to expand their overall mental capacity. To that end, we’ll be introducing a number of breast-related Japanese vocabulary words as we go along. These may or may not show up again on the RocketNews24 final exam, so take notes.
A Cup – 8 percent
Starting off our tour of Japan’s mammary mounds, Triumph informs us that eight percent of Japanese women make up the most petite category, who are sometimes referred to as having hinyuu, or “impoverished breasts.”
B – 23.8 percent
One size up, and we see a considerable jump, as women with B cups made up the second-most populous segment.
The standard, textbook Japanese word for breasts is mune, which just like in English, is also used to talk about the cut of chicken.
C – 26.7 percent
More women than any other segment fell into this category, keeping with C cups being what many Japanese guys perceive as moderately-sized.
While we’re on the letter C, chichi is another term for breasts, and is the word for a cow’s udders, as well. Ironically, chichi is also the Japanese word for father, although the two are spelled with different kanji characters.
D – 22 percent
Moving into the realm of the well-endowed in Japan, 22 percent of women fell into this category.
A favorite of naughty kids and dirty old men, oppai combines admiration of the form with a feeling of immaturity on the part of the speaker, equivalent to “boobs” or “boobies” in English.
E – 12.8 percent
We see a sudden drop-off in our distribution curve, as the size of the E group is only slightly above 50% that of the D group.
The direct opposite of the above-mentioned hinyuu is hounyuu, or “bountiful breasts.”
F – 4.8 percent
As we push on into swimsuit model-class, the ranks become even thinner, yielding the fewest representatives so far.
Kyonyuu literally means “giant breasts,” although since it contains the same kyo as breakout anime hit Shingeki no Kyojin, known in English as Attack on Titan, “titanic breasts” would also be an acceptable translation.
G – 1.5 percent
And finally, we come to the smallest group (in number of representatives) of all, consisting of just 1.5 percent of women.
For describing the truly oversized bust, there’s bakunyuu, the evocative term meaning “exploding breasts.”
And so ends our journey through the peaks and valleys of Triumph’s database. For extra fun, stick the percentages into your computer’s spreadsheet program, then plot the points as a connected line graph. You’ll be treated to a rudimentary outline of a breast.
Truly, nature is both mysterious and magnificent in her workings.
Statistics source: Hachima Kikou

Japanese men reveal their favorite women’s lingerie colors in survey
Size, shape, or suppleness – What does Japan want in a pair of breasts?【Survey】
Chinese restaurant gives discounts to women based on their breast size, G-cup gets 65 percent off
10 realities about life with large breasts, according to Japanese survey
Japan’s new fashion brand for large-breasted women smashes crowdfunding goal
Japanese onsen egg maker from 100-yen store Daiso needs to be on your shopping list
Japanese man drives truck that’s on fire directly to fire station, drops flaming potatoes[Videos]
Expo 2025 mascot Myaku-Myaku to release tastefully erotic photo book
Cherry blossoms begin blooming in Japan with record-early starts for sakura season
Starbucks Japan releases new My Fruit³ Frappuccino at only 34 stores around the country
McDonald’s Japan celebrates spring with… a Strawberry Shortcake Pie?!?
Super Mario teams up with JR Kyushu for the perfect power-up steamed bun snack
We asked our Japanese team of writers how they deal with seasonal allergies in Japan
Reading books makes you aware we live in the Matrix, artist depicts
Mos Burger releases new teriyaki burger-flavored snack fries with a slight identity crisis
Train station platform ramen store closes its doors on half a century of history in Tokyo
Studio Ghibli releases Catbus pullback keychain that runs like the anime character
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
Starbucks Japan opens new cafe and art gallery in top Tokyo tourist neighbourhood
The top 10 graduation songs in Japan as chosen by current Japanese high school students
7-Eleven Japan’s giant fried chicken skewer would be too big to eat, so it’s really for cuddling
Starbucks Japan unveils new sakura cherry blossom collection for hanami season 2026
The 10 most annoying things foreign tourists do on Japanese trains, according to locals
Starbucks Japan releases new sakura goods and drinkware for cherry blossom season 2026
Nine great places to see spring flowers in Japan, as chosen by travelers (with almost no sakura)
Naruto and Converse team up for new line of shinobi sneakers[Photos]
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
Starbucks Japan releases a new Cream Puff Frappuccino for a limited time
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
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
Lingerie for girls with smaller breasts: feast’s new collection “Glossy Ribbon Mermaid” is too cute
Man’s image of the ideal female body is shockingly skinny even by Japanese standards
Japan’s Kanji of the Year for 2023 reveals the worries of Japanese society
All you need to know about Japan’s unasked-for restaurant appetizers that you have to pay for
Tokyo’s Sakeice O’Choco alcoholic hot chocolate both does and doesn’t contain “sake”
Lingerie lucky bag from Japan’s Peach John includes anime cosplay bra/panty set, maybe by accident
Japan’s new “Cunte” contact lenses aren’t pronounced like you’re probably thinking they are