I Messed Up and Made the Wrong Person Into a Magical Girl!.

間違った子を魔法少女にしてしまった

Machimaho: I Messed Up and Made the Wrong Person Into a Magical Girl! (Japanese: 間違った子を魔法少女にしてしまった, Hepburn: Machigatta Ko o Mahō Shōjo ni Shiteshimatta) is a Japanese manga series written and illustrated by Souryu. It has been serialized on Shinchosha's Kurage Bunch website since October 2016; as of January 2025, thirteen volumes have been released.