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]

English: Onimai: I'm Now Your Sister!
Synonyms: Onimai, Onii-chan is Done For
Japanese: お兄ちゃんはおしまい！
Type: TV
Episodes: 12
Status: Finished Airing
Aired: Jan 5, 2023 to Mar 23, 2023
Score: 7.64
Premiered: Winter 2023
Broadcast: Thursdays at 23:30 (JST)
Producers: Pony Canyon, Movic, AT-X, TOHO animation, Tokyo MX, Hakuhodo DY Music & Pictures, BS11, Egg Firm, Ichijinsha, Bit grooove promotion, Pia, TOHO Music
Licensors: Unknown
Studios: Studio Bind
Source: Manga
Themes: CGDCT, Magical Sex Shift, School
Demographic: Shounen
Duration: 23 min. per ep.
Rating: PG-13 - Teens 13 or older