Oniichan wa Oshimai! (Onimai: I'm Now Your Sister!)

Self-professed "home security guard" Mahiro Oyama has not left his home in years, secluding himself in his room playing erotic visual novels. This depraved lifestyle causes his prodigious sister, Mihari, to worry about his well-being. In hopes of solving this problem, she devises a plan to rehabilitate him back to normalcy. The first part of Mihari's plan is to concoct a medicine that changes her brother's biological constitution into a bona fide female, much to Mahiro's vehement dismay. Stuck in this predicament, Mahiro has no choice but to live out his life as a cute girl until the effect wears off—if it ever does. [Written by MAL Rewrite]

Onimai: I'm Now Your Sister! ( Oniichan wa Oshimai! ) Episode 1 Review

Manga Mogura RE on X: Onimai: I'm now your Sister Vol.7 regular & special edition by Nekotoufu Series has 1 million copies (including comic anthology & digital) in circulation Tv Anime starting

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Onii-chan wa Oshimai! (ONIMAI: I'm Now Your Sister!) · AniList

Characters appearing in ONIMAI: I'm Now Your Sister! Manga

Onimai Onimai Onimai Oniichan wa Oshimai! Onimai I'm Now Your Sister! 4 Sticker for Sale by IreneTurnerv in 2023

Onii-chan wa Oshimai! (ONIMAI: I'm Now Your Sister!) · AniList

Retolee

ONIMAI: I'm Now Your Sister! Anime About Turning Into a Girl Shares Trailer

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Onii-chan wa Oshimai! (ONIMAI: I'm Now Your Sister!) Image by natuyamai #3912125 - Zerochan Anime Image Board

Dakimakura Cover - Onimai / Oyama Mahiro (お兄ちゃんはおしまい! 抱き枕カバー / 緒山まひろ)

Onimai: I'm Now Your Sister! - Wikipedia