Meet the Cast of ONIMAI: I'm Now Your Sister!

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.

Main Cast of ONIMAI: I'm Now Your Sister!

Marika Kouno

as Mahiro Oyama (voice) (12 episodes)

Marika Kouno (高野麻里佳, Kōno Marika, born February 22, 1994) is a Japanese voice actress (seiyū) and singer from Tokyo....

Kaori Ishihara

as Mihari Oyama (voice) (12 episodes)

Kaori Ishihara is a Japanese pop singer, voice actress, idol, and actress managed by Style Cube since 2011. She was f...

Hisako Kanemoto

as Kaede Hozuki (voice) (12 episodes)

Hisako Kanemoto, also known as Juri Aikawa, is a Japanese voice actress from Okayama Prefecture, Japan. She is affil...

Minami Tsuda

as Momiji Hozuki (voice) (12 episodes)

Minami Tsuda (津田美波, Tsuda Minami, born June 8, 1989) is a Japanese voice actress (seiyū) from Kanagawa Prefecture. S...

Kana Yuuki

as Asahi Ohka (voice) (12 episodes)

Natsumi Hioka

as Miyo Murosaki (voice) (12 episodes)

Secondary Cast of ONIMAI: I'm Now Your Sister!

Hiroaki Miura

as Seme (voice) (1 episode)

Hisayoshi Suganuma

as Uke (voice) (1 episode)

Hisayoshi Suganuma (菅沼久義, Suganuma Hisayoshi, September 30, 1978) is a Japanese voice actor born in Tokyo affiliated...

Reimi

as Child - Brother (voice) (1 episode)

Emiri Suyama

as Woman A (voice) (1 episode) , Clerk (voice) (1 episode) , Woman B (voice) (1 episode)

Emiri Suyama (陶山恵実里, Suyama Emiri, May 26, 1999) is a Japanese voice actress and idol from Tokyo and former member o...

Yuuya Uchida

as Leonardo (voice) (1 episode)

Voice actor and stage actor. Not to be confused with the musician and actor Yuya Uchida (1939-2019).

Kumiko Nakane (中根久美子, Nakane Kumiko, August 18) is a Japanese voice actress (seiyū) from Fukushima Prefecture. She i...

Misaki Watada

as Minori Shiina (voice) (4 episodes)

Miyuu Takatsuki

as Satsuki Takada (voice) (4 episodes)

Sayako Tojo

as Mai Yasaka (voice) (3 episodes)

Mitsuki Nakamura

as Announcer (voice) (1 episode) , Truant Officer (voice) (1 episode)

Rena Aoshima

as Yuta Sakurada (voice) (4 episodes)

Rika Abe

as Minato Senkawa (voice) (4 episodes)

Yuuki Yamamoto

as Rin Minakata (voice) (1 episode)

Hina Youmiya

as Clerk (voice) (1 episode)

Rika Nagae

as Yuriko Kitahara (voice) (1 episode)

Rika Nagae (長江里加, Nagae Rika, September 28) is a Japanese voice actress (seiyuu) born in Saitama Prefecture. She is ...

Karin Oda

as Miyako Nagase (voice) (2 episodes)

Fumiko Uchimura

as Takeshi Haijima (voice) (2 episodes)

Fumiko Uchimura (内村史子, Uchimura Fumiko, December 16) is a Japanese voice actress from Kagoshima Prefecture. She is a...

Saya Tanaka

as Makoto Kodaira (voice) (2 episodes)

Sachiko Okada

as Landlady (voice) (1 episode)

Sachiko Okada was born on April 5, 1980 and is currently 44 years old.

Kosuke Kobayashi

as Announcement (voice) (1 episode)

Kosuke Kobayashi (小林康介, Kobayashi Kōsuke, born January 28, 1980) is a Japanese voice actor from Toyama Prefecture. H...

Hironari Nemoto

as Movie Narration (voice) (1 episode)

Yoshie Saito

as Erotic Game Voice (voice) (1 episode) , Child - Sister (voice) (1 episode) , Reporter (voice) (1 episode) , Tomoya Kiba (voice) (2 episodes)

Ren Arata

as Student B (voice) (1 episode)

Rin Mizuki

as Mari Nishinomiya (voice) (3 episodes)

Mia Sakurai

as Nemu Fujimi (voice) (3 episodes)

Crew of ONIMAI: I'm Now Your Sister!

Discover the backstage crew of ONIMAI: I'm Now Your Sister! →

ONIMAI: I'm Now Your Sister!

お兄ちゃんはおしまい！