Mr. Osomatsu (Osomatsu-san)
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50 free Mr. Osomatsu (Osomatsu-san) trivia questions with answers — trivia quiz, new questions added Oct 2026.
Mr. Osomatsu took a children's gag manga from the 1960s and asked what its mischievous sextuplets would be like as adults. The answer, six identical layabouts with wildly different personalities, turned the anime into a phenomenon when it began airing in 2015, and Osomatsu-san has since run to four seasons, several films and a live-action movie. This quiz covers the whole Matsuno household and the oddballs around it: Osomatsu, Karamatsu, Choromatsu, Ichimatsu, Jyushimatsu and Todomatsu, plus Iyami, Chibita, Totoko, Hatabo, Dekapan and the rest. Expect questions on each brother's quirks, the best-known episodes and skits, the voice cast and staff, the theme songs, the films, and the original Osomatsu-kun. The early questions suit anyone who has watched a few episodes. Later rounds are for fans who remember the stranger sketches and the history behind the series. Every answer comes with a short explanation.
30 of 50 questions with answers and explanations. Play the quiz
Q 01Which movie monster copied the pose of Osomatsu-kun's Iyami in the film Invasion of Astro-Monster?
Godzilla
Godzilla strikes Iyami's flailing pose in the 1965 film, a craze so big in Japan that children copied it in every photo. John Lennon and Paul McCartney struck it too on their visit.
Q 02The grown-up Matsuno brothers of Mr. Osomatsu all still live with their parents as what?
NEETs
NEETs, people not in education, employment or training, is what all six have become, ten years older than in the 1960s manga. Their father, a salaryman, is the family breadwinner.
Q 03Ichimatsu, the gloomy fourth-born brother of Mr. Osomatsu, is devoted to which animals?
Cats
Cats are Ichimatsu's closest friends, and one episode doses his favorite with a serum that lets it speak and read minds, exposing his true feelings.
Q 04Jyushimatsu, the hyperactive airhead of the Mr. Osomatsu sextuplets, is obsessed with which sport?
Baseball
Baseball is Jyushimatsu's passion, and he practices swings with his own bat whenever he has a spare moment. The first season even ends with the whole family entering a tournament.
Q 05Karamatsu is taken hostage in Mr. Osomatsu over an unpaid tab at a stand selling which dish?
Oden
Oden is the simmered hotpot Chibita sells from his stand, and his kidnap plan flops because the brothers do not care enough about Karamatsu to pay up.
Q 06Dekapan, the genial scientist of Mr. Osomatsu, runs his experiments dressed in nothing but what?
Striped boxers
Striped boxers are all Dekapan ever wears, and he hides all sorts of things inside them. His name is short for a Japanese phrase meaning huge pants.
Q 07Hatabō, the childlike tycoon of Mr. Osomatsu, has gone through life with what stuck in his head?
A small flag
A small flag has been lodged in Hatabō's skull since boyhood, and his name means flag boy. As an adult he is a multibillionaire who still gets around by tricycle.
Q 08Mr. Osomatsu was produced to celebrate which milestone for the late creator of the original manga?
His 80th birthday
His 80th birthday fell in 2015, seven years after the artist died at 72. The studio first planned a remake of the children's series before aging the brothers into adults.
Q 09Totoko, the self-styled heroine of Mr. Osomatsu, performs as an idol themed around what?
Fish
Fish costumes are Totoko's gimmick because her family runs a thriving fishmonger's shop, yet the act wins her almost no fans beyond the six brothers.
Q 10Flat-broke Iyami learns in Mr. Osomatsu that which part of his body contains a rare metal?
His buck teeth
His buck teeth turn out to hold a metal worth a fortune, a windfall for a schemer who has sunk to sleeping under a bridge. They have been his trademark since the 1960s manga.
Q 11Choromatsu, the most responsible brother in Mr. Osomatsu, wears which trademark color?
Green
Green sets Choromatsu apart from five brothers with the same face, each given his own color for the 2015 series. In the old manga the six were drawn to be impossible to tell apart.
Q 12Osomatsu, eldest of the Mr. Osomatsu sextuplets, bets on horses and spends his days playing what?
Pachinko
Pachinko, Japan's noisy pinball-style gambling game, eats up Osomatsu's days. All six brothers love it, and anyone who wins big soon has the takings seized by the others.
Q 13Karamatsu, the self-styled cool guy of Mr. Osomatsu, peppers his speech with which foreign language?
English
English phrases are part of Karamatsu's act, along with a leather jacket, sunglasses and the fangirls he imagines for himself. His brothers tend to ignore whatever he says.
Q 21Which manga artist, nicknamed the King of Gag Manga, created the sextuplets of Mr. Osomatsu?
Fujio Akatsuka
Fujio Akatsuka launched Osomatsu-kun in 1962 and won a Shogakukan Manga Award for it two years later. Born in Manchuria, he began his career drawing comics for girls.
Q 22Which voice actor, heard as Levi in Attack on Titan, plays idol-obsessed Choromatsu in Mr. Osomatsu?
Hiroshi Kamiya
Hiroshi Kamiya voices Choromatsu, one of six star actors cast as the brothers. In the earlier anime of the 1960s and 1980s, every one of the six was played by a woman.
Q 23Which studio made both the 1988 Osomatsu-kun anime and Mr. Osomatsu, nearly three decades apart?
Pierrot
Q 14Iyami, the scheming con artist of Mr. Osomatsu, boasts of having returned from which country?
France
France is where Iyami claims to have toured, though the original manga keeps hinting he has never been. He once tried to eat the shells of his escargot.
Q 15Stranded on a deserted island in Mr. Osomatsu, the cast's new society collapses fighting over what?
Toilet paper
Toilet paper starts the war when one brother finds some and tries to keep it for himself. The battle escalates until everyone on the island awakens latent superpowers.
Q 16A crude parody of which children's hero got Mr. Osomatsu's third episode edited for rebroadcast?
Anpanman
Anpanman was spoofed with Dekapan as a caped hero who ends up in jail. The broadcaster's president later called the skit disrespectful to the original.
Q 17Which boy band played the six brothers in the 2022 live-action Mr. Osomatsu film and sang its theme?
Snow Man
Snow Man has nine members, so three of them played new characters named Period, End and Close. It was the first live-action film made from the franchise.
Q 18A spin-off series of anime shorts reimagines the sextuplets of Mr. Osomatsu as which animals?
Dogs
Dogs modeled on the six brothers star in Matsu Inu, which grew out of a line of character goods and aired from October to December 2023.
Q 19The matching hoodies worn by the six brothers of Mr. Osomatsu carry the emblem of which tree?
Pine
Pine is what matsu means in Japanese, and the word sits in the family name and at the end of all six brothers' names. Each brother wears the hoodie in his own color.
Q 20How do the six adult Matsuno brothers of Mr. Osomatsu sleep at night in their parents' house?
In one long futon
In one long futon is how all six bed down, lined up side by side. It works on a calm night, less so when the others stay noisy until morning.
Pierrot, the studio behind Naruto and Bleach, made both. Its 1988 series pushed Iyami and Chibita into the lead roles and drew ratings as high as 20 percent.
Q 24Mr. Osomatsu director Yoichi Fujita came to the show from which long-running gag anime?
Gintama
Gintama veterans filled the staff: Fujita brought along head writer Shu Matsubara and several others who had worked on that series.
Q 25Which streaming service simulcast the first season of Mr. Osomatsu to viewers outside Japan?
Crunchyroll
Crunchyroll streamed each episode as it aired in Japan, and later added a commentary track by the voice cast for the year-end special.
Q 26Which idol group sang the opening themes for three seasons of Mr. Osomatsu before disbanding?
AŌP
AŌP sang all six openings across those seasons before splitting up in 2021, so DA PUMP took over for season four.
Q 27In the 2019 Mr. Osomatsu anime film, the brothers wake in a world of memories after attending what?
A class reunion
A class reunion leaves the six sulking over old classmates with proper careers, so they drink until they fall asleep. They wake among their own 18-year-old selves, just before graduation.
Q 28On a rainy evening in Mr. Osomatsu, the brothers show their strengths and flaws playing which game?
Mahjong
Mahjong fills the first half of an episode that then introduces Godmatsu, a saintly extra brother formed from the goodness the six have lost.
Q 29When the Matsuno parents plan to divorce in Mr. Osomatsu, what must each son face to be chosen?
An interview
An interview lets each parent choose which sons to go on supporting, so the six pitch themselves like applicants. The couple blame differences in direction, like a band splitting up.
Q 30Todomatsu, the outgoing youngest brother of Mr. Osomatsu, manipulates others by playing up what?
His cuteness
His cuteness as the baby of the family is Todomatsu's weapon. He has been dubbed a dry monster for the cold calculation underneath the charm.