ONIMAI: I'm Now Your Sister!

Mahiro Oyama is a lazy gamer who spends most days lost in fantasy and games rather than real life. His world turns upside down when his younger sister Mihari uses a lab device and accidentally turns him into a girl. He vows to fix things, but the new body opens his eyes to a different rhythm of daily life and a chance to rethink what really matters. School, chores, and social encounters gain a new texture as he tests the limits of this awkward, funny situation. The series leans into light hearted humor and warm moments, letting Mahiro discover responsibility, friendship, and what it means to grow up while keeping a wink at his old life.

Based on Nekotofu's Onimai manga, the series was produced by Studio Bind and released in 2023. Creators Michiko Yokote and Nekotofu helped shape the adaptation into a bright, comedic show.

Critics and fans praise the light tone and amiable character dynamics. The show explores identity, family support, and personal growth as Mahiro tests boundaries and learns to value others in his changed life. It holds a 7.4 out of 10 rating from 54 votes.

Even at this stage the title has sparked online chatter about gender and daily life, with viewers appreciating its affectionate humor and the fond sisterly bond at its core. It stands out for treating change with warmth rather than snark.