Quick Answer
OniAi is streaming on Crunchyroll. 12 episodes (~5h total watch time). Availability may vary by region.
Where to Watch OniAi
OniAi is currently on Crunchyroll. Keep in mind that catalogs change by region — if you don't see it on your usual service, check the other platforms listed here.
Confirmed Streaming Platforms
Subscription availability by JustWatch
Check Other Platforms
Anime licensing changes by region. If OniAiisn't on your usual service, try these.
About OniAi
After their parents' deaths, brother and sister Akito and Akiko Himenokouji were forced to live with separate families for six years. But now they have finally reunited and begin to live together. It quickly becomes apparent that Akiko harbors romantic feelings for her brother; however, Akito only sees her as a sibling. When three more girls—Anastasia Nasuhara, Arashi Nikaidou, and Ginbei Haruomi Sawatari—move into their apartment, Akiko's hopes of living alone with her brother vanish....
Full details on MyAnimePulseFrequently Asked Questions
Where can I watch OniAi legally?
Right now, OniAi is on Crunchyroll. 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 OniAi on Netflix or Crunchyroll?
It's confirmed on Crunchyroll. Netflix availability depends on your region — some countries have it, others don't.
Is OniAi 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 OniAi.
Can I watch OniAi 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.