Every season of ONIMAI: I'm Now Your Sister! ever, ranked from best to worst by thousands of votes from fans of the show. The best seasons of ONIMAI: I'm Now Your Sister!!

Mahiro's Confusing New Body

Mahiro's Time of the Month

Mahiro's Close Encounter

Mahiro's New Friend

Mahiro Discovers Adventure and Social Gatherings

Mahiro Goes Back to Middle School

Mahiro's Role-Playing Game

Mahiro's First Girls Sleepover

Mahiro Rings in the New Year

Mahiro Ponders Boobs and Identity

Mahiro Pretties Up

Mahiro's Future as a 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.

The Best Seasons of ONIMAI: I'm Now Your Sister!

The Best Seasons of ONIMAI: I'm Now Your Sister!

Season 1