of Tennis manga.

Isekai Tennis Musō began to create a buzz online due to The Prince of Tennis fans' criticism of Nozomi and Yūnagi's work. Some fans debated whether the novel is an homage to Konomi's work or intentional plagiarism. Twitter users said that the creators had previously acknowledged Konomi's popular manga and tweeted about it. Other fans suggested that The Prince of Tennis fans may be overreacting.

Without mentioning The Prince of Tennis, Nozomi posted an apology on Twitter on Friday. He apologized for upsetting fans and said he is reflecting on the situation.

The story of Isekai Tennis Musō centers on high school tennis prodigy who finds himself summoned to another world as a hero. The magician who summoned him believes his could be indispensable in the land. Usinghis tennis mastery, the boy can defeat a dragon in one hit or crush a demon army. He sets himself apart from other elite forces battling evil, but the demon king is also a tennis player.

Game developer KOEI Tecmo Games filed trademarks for "Baseball Musō," "Tennis Musō," and "Soccer Musō" on January 5. However, there is no confirmation whether the "Tennis Musō" trademark is related to Nozomi and Yūnagi's novel series.

Nozomi launched Isekai Tennis Musō this month after ending his Inō-Battle wa Nichijō-kei no Naka de ( Inou-Battle in the Usually Daze ) light novel series. Inō-Battle wa Nichijō-kei no Naka de inspired the When Supernatural Battles Became Commonplace anime adaptation from Studio Trigger in 2014. Crunchyroll streamed the series as it aired, and Sentai Filmworks released the