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Comedy anime 'Onimai: I'm Now Your Sister!' releases 1st PV for January 2023 broadcast

Marika Kouno will be voicing boy-turned-girl Mahiro Oyama, while Kaori Ishihara will voice little sister Mihari.

By: Nicole S. Castro on August 12, 2022 at 10:05 PHT

The first promotional video has been released for the TV anime adaptation of Nekotofu's comedy manga series Onimai: I'm Now Your Sister!

The anime is slated to air in January 2023 and is animated by Studio Bind.


The series stars male protagonist and gamer Mahiro Oyama (CV: Marika Kouno), who wakes up one morning as a girl. His transformation was caused by his mad scientist little sister, Mihari (CV: Kaori Ishihara), who tried one of her new experiments on him.


  • Mahiro Oyama (CV: Marika Kouno)

  • Mihari Oyama (CV: Kaori Ishihara)

  • Kaede Hozuki (CV: Hisako Kanemoto)

  • Momiji Hozuki (CV: Minami Tsuda)

Onimai: I'm Now Your Sister! (Japanese: お兄ちゃんはおしまい!, Romaji: Onii-chan wa Oshimai!) is a manga series written and illustrated by Nekotoufu. It has been serialized on Ichijinsha's Monthly ComicREX magazine since June 2018.


  • Original work: Nekotoufu (serialized in Ichijinsha's Monthly ComicREX)

  • Director: Shingo Fujii

  • Series composition: Michiko Yokote

  • Character design: Ryou Imamura

  • Music: Daisuke Achiwa, Alisa Okehazama

  • Production: EGG FIRM

  • Animation: Studio Bind

Source: Onimai: I'm Now Your Sister! official Twitter, official website, Comic Natalie




Nicole is based in the Philippines and works as a freelance Japanese Translator/Interpreter and copywriter (English). She is a JLPT N2 passer who watches anime to "study" for N1. She has a long career history on LinkedIn (with primary focus on media and translation), but her anime watchlist is much, much longer.