ONIMAI: I'm Now Your Sister!
ONIMAI: I'm Now Your Sister!
Now Showing

ONIMAI: I'm Now Your Sister!

7.4
Yr 2023
Rt 24m
Status Ended
Animation Comedy
Your Verdict

Rate this show to unlock picks like it. Create a free account.

Back
Series Brief

Overview

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.

Critical Reception

What critics are saying

Score 68 /100

Critical reception for ONIMAI: I'm Now Your Sister! is sharply divided, with responses ranging from enthusiastic praise to strong criticism. Positive reviews celebrate the anime's vibrant visual style, soft pastel palette, and surprisingly cute, wholesome tone. Some critics even hailed it as one of the standout shows of its season, praising its fitting soundtrack and charming aesthetic details.

Conversely, the series raised major concerns due to its controversial premise and fan-service elements. Critics sensitive to its subject matter dismissed it as distasteful, while other reviewers noted that despite its controversial aspects, the show remains worth watching for those comfortable with its tropes. Ultimately, consensus frames the show as a highly polarizing viewing experience.

“Onimai is the best anime of the season”

“an incredibly cute and wholesome anime that I thoroughly enjoyed watching”

“certainly worth the watch, despite certain controversial elements”

“looks like pure lolicon garbage”

Transmission Paths

Where to Watch

Crunchyroll
US • UK • CA
Crunchyroll Amazon Channel
US • UK • CA
Why fans love it

ONIMAI: I'm Now Your Sister! blends comedy and slice of life through the sudden transformation of Mahiro Oyama. The narrative mines the daily awkwardness of junior high school for humor, focusing on the friction between a former shut-in and the unpredictable realities of his new social environment. While the show explores a gender swap premise, the core tension stems from a character attempting to navigate middle school expectations while secretly nursing the habits of his previous life.

The animation style anchors the show's erratic tone, moving between moments of intense, enraged outbursts and quiet observations of school life. Marika Kouno brings a specific cadence to the protagonist that emphasizes his internal conflict as he balances scientific experimentation with growing pains. It is a show built on the absurdity of its own internal logic, moving away from high-stakes drama to keep the focus squarely on the small-scale complications of an unwanted identity shift.

Featured Players

Cast

Credited 36
Regulars 11
Longest run 5 eps
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)
Hiroaki Miura
Hiroaki Miura
as Seme (voice)
1 episode
Hisayoshi Suganuma
Hisayoshi Suganuma
as Uke (voice)
1 episode
Show 28 more
Reimi as Child - Brother (voice) 1 episode Emiri Suyama as Woman A (voice) 3 episodes Yuuya Uchida as Leonardo (voice) 1 episode Hironari Nemoto as Movie Narration (voice) 1 episode Erisa Kuon as Woman B (voice) 3 episodes Kousuke Goto as Spabone (voice) 1 episode Enako as Nicolala (voice) 1 episode Yuri Ise as Student A (voice) 1 episode Yoshie Saito as Tomoya Kiba (voice) 5 episodes Ren Arata as Student B (voice) 1 episode Rina Tsukishiro as Nodoka Fushimi (voice) 3 episodes Kumiko Nakane as Watch Stand (voice) 2 episodes Misaki Watada as Minori Shiina (voice) 4 episodes Miyuu Takatsuki as Satsuki Takada (voice) 4 episodes Sayako Tojo as Mai Yasaka (voice) 3 episodes Rena Aoshima as Yuta Sakurada (voice) 4 episodes Mitsuki Nakamura as Truant Officer (voice) 2 episodes Rika Abe as Minato Senkawa (voice) 4 episodes Rin Mizuki as Mari Nishinomiya (voice) 3 episodes Yuuki Yamamoto as Rin Minakata (voice) 1 episode Hina Youmiya as Clerk (voice) 1 episode Mia Sakurai as Nemu Fujimi (voice) 3 episodes Rika Nagae as Yuriko Kitahara (voice) 1 episode Karin Oda as Miyako Nagase (voice) 2 episodes Fumiko Uchimura as Takeshi Haijima (voice) 2 episodes Saya Tanaka as Makoto Kodaira (voice) 2 episodes Sachiko Okada as Landlady (voice) 1 episode Kosuke Kobayashi as Announcement (voice) 1 episode
Signal Match

Similarity

Where ONIMAI: I'm Now Your Sister! overlaps with other shows, and exactly what they have in common.

Keyword Cloud

Keywords

slice of life middle school based on manga junior high school school life ecchi anime gender swap age change grand middle school girls japanese junior high schooler enraged
Technical Sheet

Details

First Aired
January 05, 2023
Status
Ended
Episode Runtime
24 minutes
Origin
JP
TMDB Votes
63