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Currently you are able to watch "Onimai: I'm Now Your Sister! - Season 1" streaming on Crunchyroll Amazon Channel, Crunchyroll.
There are no options to watch Onimai: I'm Now Your Sister! for free online today in Canada. You can select 'Free' and hit the notification bell to be notified when season is available to watch for free on streaming services and TV.
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.