ONIMAI: I'm Now Your Sister!

🇯🇵お兄ちゃんはおしまい！ · Onii-chan wa Oshimai!

MangaSeinenOngoing🇯🇵 First published in 2017ComedySlice of Life

Nekotofu story, art

Mahiro Oyama was just a normal erotic-game loving dude…until he woke up one morning as a woman! Turns out his mad-scientist little sister, Mihari, tried out one of her new experiments on him…with a disastrous outcome, as far as Mahiro’s concerned! But Mihari is as determined to study him as he is determined to go back to his shut-in, game-playing life, and o…

Synopsis via AniList