★ 7.5 TV Series
Lucky☆Star
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… Read more
Storyline
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! (Source: Kodansha USA)
Trailer
Characters & Japanese Voice Cast
Mahiro Oyama
Main
VA: Marika Kouno
Mihari Oyama
Main
VA: Kaori Ishihara
Kaede Hozuki
Supporting
VA: Hisako Kanemoto
Momiji Hozuki
Supporting
VA: Minami Tsuda
Asahi Ouka
Supporting
VA: Kana Yuuki
Miyo Murosaki
Supporting
VA: Natsumi Hioka
Nemu Fujimi
Supporting
VA: Mia Sakurai
Minato Senkawa
Supporting
VA: Rika Abe
Yuriko Kitahara
Supporting
VA: Rika Nagae
Yuuta Sakurada
Supporting
VA: Rena Aoshima
Nodoka Fushimi
Supporting
VA: Rina Tsukishiro
Raika
Supporting
VA: Kuon ErisaSimilar Anime
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Frequently Asked Questions
How many episodes does ONIMAI: I'm Now Your Sister! have?
ONIMAI: I'm Now Your Sister! has 12 episodes.
Which studio made ONIMAI: I'm Now Your Sister!?
ONIMAI: I'm Now Your Sister! is produced by Studio Bind.
Facts from AniList (also listed on MyAnimeList); streaming availability from JustWatch India. Last updated 16 October 2026, 11:11 PM IST. Episode times are Japan broadcast times shown in IST. Spotted a mistake? Write to [email protected].