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.
What critics are saying
Verdicts use the same scale as your list: highly recommended through avoid — plus optional scores and blurbs.
Nobody on Critic, Sir! has logged a verdict for this title yet. The silence is either respectful or suspicious.
Sign in and use Add to My List below to share your own verdict.
Trailer
Official Trailer [Subtitled]
Where to Watch(AU)
Streaming data provided by JustWatch via TMDB.
Cast
Seasons
1.Mahiro's Confusing New Body
7.305-01-202323 minWe follow Mahiro Oyama, an unemployed good-for-nothing shut-in, who not only hasn't left the house in two years, but is also exceedingly addicted to gross video games. One afternoo...
2.Mahiro's Time of the Month
5.012-01-202323 minAs Mahiro stumbles through his new life as a girl, he finds himself gradually beginning to get into the swing of things. Realizing this, however, prompts him to try and reclaim som...
3.Mahiro's Close Encounter
3.819-01-202323 minMahiro makes a mad dash for the bathroom, but when he opens the door, he finds the facilities are already occupied by a high school girl he's never met. This bold fashionista turns...
4.Mahiro's New Friend
6.026-01-202323 minMahiro loses to Mihari in a video game, so he has to do the grocery shopping this week as punishment. As an unemployed, good-for-nothing shut-in, the task at hand is daunting, but...
5.Mahiro Discovers Adventure and Social Gatherings
6.502-02-202323 minIn a rare turn of events, Mihari wakes up one morning to find Mahiro has gotten up before her. Since the corner store was going to start selling clear files from his favorite anime...
6.Mahiro Goes Back to Middle School
6.509-02-202323 minMomiji shows up at Mahiro's house with her two classmates, Asahi Ohka and Miyo Murosaki, to invite him out for parfaits.
7.Mahiro's Role-Playing Game
6.516-02-202323 minJust when Mahiro is beginning to get used to middle school life again, finals are upon them. Despite his initial blasé attitude, Mahiro finds himself reluctantly handing in a 80% b...
8.Mahiro's First Girls Sleepover
6.523-02-202323 minIt's finally winter break and Mahiro is excited to get into his Winter Vacation Mode. Unbeknownst to him, however, Mihari invites Momiji and the others over for a sleepover. She ho...
9.Mahiro Rings in the New Year
3.802-03-202323 minIt's Christmas and Mahiro is shocked to hear his own little sister has a date. Unable to shake his unease, he follows her through the festive hustle and bustle in secret, with Momi...
10.Mahiro Ponders Boobs and Identity
6.509-03-202323 minIt's the start of the third semester and winter uniforms are now in effect. For Mahiro and the girls at school, this means braving the cold winter air in mandatory skirts. Who know...
11.Mahiro Pretties Up
6.016-03-202323 minHoroscopes are all the rage at school right now, and Mahiro is curious to see what all the fuss about. According to his forecast, an important occasion is on the horizon and he may...
12.Mahiro's Future as a Sister
6.523-03-202323 minMahiro and the girls take a trip to a Japanese inn over spring break. First they hit the town in their yukata, before heading to the open-air bath to detox. However, things go sout...
Watching Lists
to create and edit public lists.
Loading lists…
Purchase & Discovery
Find this title on Amazon
Digital
Prime Video & digitalAmazon mixes rent, buy, and Prime in one place — one search covers the usual options.
Physical edition
4K Blu-ray & physical releasesSearch on AmazonOfficial merchandise
Official-style merch searchApparel, collectibles, and moreAs an Amazon Associate, Critic, Sir! earns from qualifying purchases. Full disclosure