The first episode of the One-Punch Man meets magic series Mashle: Magic and Muscles has aired on Crunchyroll. The fantasy shōnen series follows the titular hero, Mash Burnedead, who is "unmarked" in a world full of marked wizards. The anime's premiere episode is very faithful to the original manga's first chapter, strengthening some emotional moments and lightly tweaking some humorous aspects.

Mashle: Magic and Muscles began as a manga series of the same name created by Hajime Kōmoto. It began serializing in Weekly Shōnen Jump in 2020. The series is ongoing and presently spans sixteen volumes. This anime adaptation comes from A-1 Pictures, which is known for producing other anime series including Black Butler, Fairy Tail, Blue Exorcist, Your Lie in April, Sword Art Online, and Lycoris Recoil, among others. Mashle: Magic and Muscles is directed by Tomoya Tanaka, with a script by Yōsuke Kuroda, and character designs by Hisashi Toshima.