Onimai: I`m Now Your Sister!

"Onimai: I'm Now Your Sister!" (Japanese: お兄ちゃんはおしまい!, "Onii-chan wa Oshimai!"), also known as "Big Brother is Done For!", is a Japanese manga series written and illustrated by Nekotofu. The series began online serialization in 2017 and has been serialized in Ichijinsha's Monthly Comic Rex magazine since April 2019. The story follows Mahiro Oyama, a NEET and otaku who is turned into a young girl by his scientist younger sister, Mihari Oyama. Mahiro must learn to live as a middle school girl and make friends in his new school. The manga has been adapted into an anime television series produced by Studio Bind, which aired from January to March 2023. The anime is known for its high production values and unique storyline. The series explores themes of gender identity, family dynamics, and personal growth, presented in a lighthearted and humorous manner. Both the manga and anime have garnered significant attention and positive reviews across multiple platforms.