Quick Answer
Since When? is streaming on Rakuten Viki, AsianCrush. 1 episodes. Availability may vary by region.
Where to Watch Since When?
Since When? is currently on Rakuten Viki, AsianCrush. 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
More Ways to Watch Since When? (US)
Watch Free
Availability data by JustWatch
Check Other Platforms
Anime licensing changes by region. If Since When?isn't on your usual service, try these.
About Since When?
Music video for the song Ittai Itsukara by Temari Tsukimura (CV: Nao Ojika).
Full details on MyAnimePulseFrequently Asked Questions
Where can I watch Since When? legally?
Right now, Since When? is on Rakuten Viki, AsianCrush. 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 Since When? on Netflix or Crunchyroll?
Can't confirm either right now. Both platforms rotate their catalogs pretty often, so it's worth searching directly on each one.
Is Since When? 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 Since When?.
Can I watch Since When? 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.