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12 Episodes
S1 E1 - Mahiro's Confusing New Body
S1 E2 - Mahiro's Time of the Month
S1 E3 - Mahiro's Close Encounter
S1 E4 - Mahiro's New Friend
S1 E5 - Mahiro Discovers Adventure and Social Gatherings
S1 E6 - Mahiro Goes Back to Middle School
S1 E7 - Mahiro's Role-Playing Game
S1 E8 - Mahiro's First Girls Sleepover
S1 E9 - Mahiro Rings in the New Year
S1 E10 - Mahiro Ponders Boobs and Identity
S1 E11 - Mahiro Pretties Up
S1 E12 - Mahiro's Future as a Sister
Streaming, rent, or buy Onimai: I'm Now Your Sister! – Season 1:
Currently you are able to watch "Onimai: I'm Now Your Sister! - Season 1" streaming on Netflix, Catchplay, Vidio or for free with ads on Vidio.
Synopsis
A lazy gamer who hasn't left the house in years must go back to school when his little sister's science experiment gives him a confounding makeover.
