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! Anime Figures Oyama Mahiro Acrylic Stands Oyama Mihari Character Model Fans Christmas Gifts

Oniichan wa Oshimai! Onimai I'm Now Your Sister! Momiji Hozuki Blue Cosplay Costume

Retolee

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

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Onimai: I'm Now Your Sister! (manga), Onii-chan wa Oshimai! Wiki

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

ONIMAI: I'm Now Your Sister! New Clip and Release Date Announced! - Serpentor's Lair

Onimai: I'm Now Your Sister! - Part 1 Blu-ray (Oniichan wa Oshimai!) (Japan)