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ONIMAI: I'm Now Your Sister!

Tags: TopManhua, Toonily, KissManga

Rating

ONIMAI: I'm Now Your Sister! Average 5 / 5 out of 19

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446

Alternative

Onii-chan wa Oshimai!, Ab sofort Schwester!, お兄ちゃんはおしまい!, Мій братик вже не братик, Мой братик теперь не братик!, 别当欧尼酱了！, 不当哥哥了！, Onii-chan Is Done For!

Genre(s)

Comedy, Ecchi, Sci fi, Slice of Life

Release

2026

Status

Ongoing

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Summary

Onii-chan wa Oshimai! / Ab sofort Schwester! / お兄ちゃんはおしまい! / Мій братик вже не братик / Мой братик теперь не братик! / 别当欧尼酱了！ / 不当哥哥了！ / Onii-chan Is Done For! 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 one thing's for sure...life is going to get a whole lot weirder from here on out! *5th place of Tsugi Manga Awards, Category Webmanga - Retail: (Direct Retail From the Mangaka) ![](https://i.imgur.com/0e9KPgq.png) Official Melon Books ![](https://i.imgur.com/t9hf4kQ.png) Official Toranoana ![](https://i.imgur.com/lGJEbPa.png) Official DLSite (jp)