ONIMAI: I'm Now Your Sister! (2023)

お兄ちゃんはおしまい！

When lazy, erotic-game loving Mahiro Oyama is transformed into a girl by his younger scientist sister's experiments, he becomes determined to change back, only to recognize that with his new opportunity, he may want to turn his life around.

ONIMAI: I'm Now Your Sister!

Watch Providers

Crunchyroll
Crunchyroll Amazon Channel

Casting arrow_drop_down

Marika Kouno
Marika Kouno
as Mahiro Oyama (voice)
Kaori Ishihara
Kaori Ishihara
as Mihari Oyama (voice)
Hisako Kanemoto
Hisako Kanemoto
as Kaede Hozuki (voice)
Minami Tsuda
Minami Tsuda
as Momiji Hozuki (voice)
Kana Yuuki
Kana Yuuki
as Asahi Ohka (voice)
Natsumi Hioka
Natsumi Hioka
as Miyo Murosaki (voice)
Yoshie Saito
Yoshie Saito
as Tomoya Kiba (voice) as Child - Sister (voice) as Reporter (voice) as Erotic Game Voice (voice)
Misaki Watada
Misaki Watada
as Minori Shiina (voice)
Miyuu Takatsuki
Miyuu Takatsuki
as Satsuki Takada (voice)
Rena Aoshima
Rena Aoshima
as Yuta Sakurada (voice)
Rika Abe
Rika Abe
as Minato Senkawa (voice)
Emiri Suyama
Emiri Suyama
as Woman B (voice) as Woman A (voice) as Clerk (voice)
Erisa Kuon
Erisa Kuon
as Woman A (voice) as Woman B (voice) as Hairdresser (voice)
Rina Tsukishiro
Rina Tsukishiro
as Nodoka Fushimi (voice)
Sayako Tojo
Sayako Tojo
as Mai Yasaka (voice)
Rin Mizuki
Rin Mizuki
as Mari Nishinomiya (voice)
Mia Sakurai
Mia Sakurai
as Nemu Fujimi (voice)
Kumiko Nakane
Kumiko Nakane
as Watch Stand (voice) as Waitress (voice)
Mitsuki Nakamura
Mitsuki Nakamura
as Announcer (voice) as Truant Officer (voice)
Karin Oda
Karin Oda
as Miyako Nagase (voice)
Fumiko Uchimura
Fumiko Uchimura
as Takeshi Haijima (voice)
Saya Tanaka
Saya Tanaka
as Makoto Kodaira (voice)
Hiroaki Miura
Hiroaki Miura
as Seme (voice)
Hisayoshi Suganuma
Hisayoshi Suganuma
as Uke (voice)
Reimi
Reimi
as Child - Brother (voice)
Yuuya Uchida
Yuuya Uchida
as Leonardo (voice)
Hironari Nemoto
Hironari Nemoto
as Movie Narration (voice)
Kousuke Goto
Kousuke Goto
as Spabone (voice)
Enako
Enako
as Nicolala (voice)
Yuri Ise
Yuri Ise
as Student A (voice)
Ren Arata
Ren Arata
as Student B (voice)
Yuuki Yamamoto
Yuuki Yamamoto
as Rin Minakata (voice)
Hina Youmiya
Hina Youmiya
as Clerk (voice)
Rika Nagae
Rika Nagae
as Yuriko Kitahara (voice)
Sachiko Okada
Sachiko Okada
as Landlady (voice)
Kosuke Kobayashi
Kosuke Kobayashi
as Announcement (voice)
arrow_drop_up

Seasons

Season 1

Season 1

Episodes season 1

  • 1x1

    Mahiro's confusing new body

  • 1x2

    Mahiro's time of the month

  • 1x3

    Mahiro's close encounter

  • 1x4

    Mahiro's new friend

  • 1x5

    Mahiro discovers adventure and social gatherings

  • 1x6

    Mahiro goes back to middle school

  • 1x7

    Mahiro's role-playing game

  • 1x8

    Mahiro's first girls sleepover

  • 1x9

    Mahiro rings in the new year

  • 1x10

    Mahiro ponders boobs and identity

  • 1x11

    Mahiro pretties up

  • 1x12

    Mahiro's future as a sister

NextFilm 2025