The official website for the anime ONIMAI: I'm Now Your Sister! revealed the second promotional video and image for it on Monday.
The video reveals more cast and crew members, as well as the anime's premiere date of January 5th . Additionally, it showcases the opening theme song, " Identeitei Meltdown ".

The new cast members include:
- Kana Yūki as Asahi Oka
- Natsumi Hioka as Miyo Murosaki
Additional members include:
- Art Director: Masayo Kobayashi
- Color Artist: Makiko Doi
- Composition Director of Photography: Akane Fushihara
- Edited by: Yuji Oka
- Sound Direction: Kohei Yoshida
- Sound Effects: Takuya Hasegawa
- Music: Daisuke Achiwa and Arisa Okehazama
Therefore, Shingo Fujii is directing the series at Studio Bind . Michiko Yokote (Shirobako) is writing the scripts, with character design by Ryo Imamura .
In the cast we have:
- Mahiro Oyama (CV: Marika Kohno)
- Mihari Oyama (CV: Kaori Ishihara)
- Kaede Hozuki (CV: Hisako Kanemoto)
- Momiji Hozuki (CV: Minami Tsuda)
Synopsis:
Mahiro Oyama was just a normal guy obsessed with erotic games… until he woke up one morning as a woman! It turns out his mad scientist little sister, Mihari, tried one of her new experiments on him… with disastrous results, as far as Mahiro is concerned! But Mihari is as determined to study him as she is determined to return to her reclusive, gaming-filled life, and one thing is for sure… life is about to get a whole lot stranger!
Finally, Nekotofu published Onii-chan wa Oshimai! through pixiv and other online platforms. Nekotofu manga serialization in Ichijinsha 's Comic Rex in April 2019.
Source: ANN

