Watch Onimai: I'm Now Your Sister! on Anitummy

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List of Episodes:

Mahiro's Confusing New Body

Mahiro and the Girl's Day Out

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

Onimai: I'm Now Your Sister!

PG-13

Self-professed "home security guard" Mahiro Oyama has not left his home in years, secluding himself in his room playing erotic visual novels. This depraved lifestyle causes his prodigious sister, Mihari, to worry about his well-being. In hopes of solving this problem, she devises a plan to rehabilitate him back to normalcy. The first part of Mihari's plan is to concoct a medicine that changes her brother's biological constitution into a bona fide female, much to Mahiro's vehement dismay. Stuck in this predicament, Mahiro has no choice but to live out his life as a cute girl until the effect wears off—if it ever does.

Anitummy is the best site to watch Onimai: I'm Now Your Sister! SUB online, or you can even watch Onimai: I'm Now Your Sister! DUB in HD quality.

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