Oniichan wa Oshimai!
English title: Onimai: I'm Now Your Sister!
Japanese title: お兄ちゃんはおしまい！
Type: TV
Episodes: 12
Premiered: winter 2023
Source: Manga
Genres: Comedy
Studios: Studio Bind
Producers: Pony Canyon, Movic, AT-X, TOHO animation, Tokyo MX, Hakuhodo DY Music & Pictures, BS11, Egg Firm, Ichijinsha, Bit grooove promotion, Pia, Toho Music
Duration: 23 min per ep
Rating: PG-13 - Teens 13 or older

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]