The Onimai: I’m Now Your Sister! anime adaptation has received its first proper trailer, which previews its genderbending premise, animation, and main cast. A January 2023 Japanese release date was revealed with the trailer.
Additional cast members were announced as well in the form of Hisako Kanemoto as Kaede Hozuki and Minami Tsuda as Momiji Hozuki. Previously announced were Marika Kouno as Mahiro Oyama and Kaori Ishihara as Mihari Oyama.
Onimai: I’m Now Your Sister! is based on the manga series by Nekotofu, which began in 2018 and has six tankoubon volumes as of April 2022. The series is serialized in Ichijinsha’s Monthly Comic Rex magazine and published under the Rex Comics label.
Kodansha USA describes the story as:
Mahiro Oyama was just a normal erotic-game loving dude…until he woke up one morning as a woman! Turns out his mad-scientist little sister, Mihari, tried out one of her new experiments on him…with a disastrous outcome, as far as Mahiro’s concerned! But Mihari is as determined to study him as he is determined to go back to his shut-in, game-playing life, and one thing’s for sure…life is going to get a whole lot weirder from here on out!
The anime is directed by Shingo Fujii who previously directed the 2019 LINE Novel original animation PV and was the action supervisor on some of Mushoku Tensei: Jobless Reincarnation‘s episodes. Other staff include Michiko Yokote (Call of the Night) as series composer, Ryou Imamura (Mushoku Tensei: Jobless Reincarnation co-prop designer, Kizumonogatari Part 1: Tekketsu main animator) as character designer, and Daisuke Achiwa and Alisa Okehazama (The God of High School) as music composers. STUDIO BIND is the animation production company with EGG FIRM credited with production.