Quick Answer
Onimai: I'm Now Your Sister! is streaming on Crunchyroll, Ani-One Asia, Anime Digital Network, Aniplus TV, Aniverse, Bahamut Anime Crazy, Bilibili Global, CatchPlay, Laftel. 12 episodes (~5h total watch time). Availability may vary by region.
Where to Watch Onimai: I'm Now Your Sister!
Good news — Onimai: I'm Now Your Sister! has official streams on Crunchyroll and Ani-One Asia plus 7 more. We've got links for all of them, along with fallback search options.
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About Onimai: I'm Now Your Sister!
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...
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Where can I watch Onimai: I'm Now Your Sister! legally?
Right now, Onimai: I'm Now Your Sister! is on Crunchyroll, Ani-One Asia, Anime Digital Network, Aniplus TV, Aniverse, Bahamut Anime Crazy, Bilibili Global, CatchPlay, Laftel. That said, anime licensing varies a lot by country — what's on Netflix in Japan might not be on Netflix in the US. If your go-to platform doesn't have it, try the other services listed above.
Is Onimai: I'm Now Your Sister! on Netflix or Crunchyroll?
It's confirmed on Crunchyroll. Netflix availability depends on your region — some countries have it, others don't.
Is Onimai: I'm Now Your Sister! available with an English dub?
Dub availability depends on the platform. Crunchyroll has been expanding their dubbed library a lot recently, and Funimation (now merged into Crunchyroll) historically had the biggest dub catalog. Check each platform's listing for Onimai: I'm Now Your Sister!.
Can I watch Onimai: I'm Now Your Sister! for free?
Crunchyroll offers a free ad-supported tier for some shows. Most other platforms require a subscription, but many offer free trials for new users. Tubi and Pluto TV occasionally have anime in their free rotation too.