Genghis Khan On February 15, 2018,
CoroCoro Comic ("
Gekkan Corocoro Comic"), a children's magazine published by Shogakukan, had in its March issue a cartoon making fun of
Genghis Khan, founder of the
Mongol Empire. The comic showed a mischievous boy doodling juvenile things on pictures of famous people, such as a dog's face on a picture of
Albert Einstein. After some backlash, Shogakukan initially offered an apology addressed to the Mongolian Embassy in Tokyo on February 23, but that failed to mollify Mongolian expats in Japan, who regard Genghis Khan as a national hero. In March 2018, Shogakukan issued another public apology, announced a national recall of the magazine and offered a refund to magazine patrons. CoroCoro Comic's website also published an apology by Asumi Yoshino, author of the serialized manga
Yarisugi!!! Itazura-kun which contained the controversial image.
Shōichi Yamamoto On February 20, 2026, a judge found liable for sexually abusing a minor. According to
Ashita no Keizai Shimbun, the victim was 15 years old and Yamamoto was her high school teacher when he intimately touched her and kissed her in a car.
Ashita no Keizai Shimbun also reported that he raped her a year later; the lawsuit alleged that Yamamoto forced the victim to eat her own excrement and took pictures of her with "slave" written on her body as "punishment". Later that same year, editors at Shogakukan conspired to have Yamamoto write
Jojin Kamen under the pen name "Hajime Ichiro". In 2026, when the civil trial publicly disclosed the verdict, '''', the platform where Yamamoto's works were published, released a public statement that they would be suspending
Jojin Kamen, wherein they also revealed that the author was Yamamoto. Shogakukan also released a separate statement, which apologized for the affair and promised an investigative committee to look into the incident would be formed. Eri Tsuruyoshi, the illustrator of
Jojin Kamen, posted on social media that they did not know about Yamamoto's legal case and had only met him once, with all communication coming through their editor. They also expressed hope that the victim would recover and apologized to readers.
Ryuhei Tamura (
Cosmos),
Haro Aso (
Zom 100: Bucket List of the Dead), Kaeru Mizuho (
Magical Girl Dandelion), and ('''') asked that their respective series' publication on
MangaONE be halted.
One-Punch Man creator
One stated that he would not work with Shogakukan again if the matter is not resolved. The award ceremony for the 71st
Shogakukan Manga Award, which was originally scheduled to be held on March 3, was postponed. On March 2, 2026, Shogakukan discovered that
MangaONE published
Seisō no Shinri-shi, a manga written by
Act-Age writer under the pen name "Miki Yatsunami", who had been arrested and indicted on the charge of committing a coerced indecent act on a female middle school student in 2020. ==List of magazines published==