Quick Answer
B: The Beginning is streaming on Netflix. 12 episodes (~5h total watch time). Availability may vary by region.
Where to Watch B: The Beginning
B: The Beginning is currently on Netflix. 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 B: The Beginning (US)
Prices and full options on JustWatch
Availability data by JustWatch
Check Other Platforms
Anime licensing changes by region. If B: The Beginningisn't on your usual service, try these.
About B: The Beginning
On the islands of Cremona, a vigilante runs amok. Celebrated by some and hunted by others, the notorious "Killer B" takes justice into his own hands, armed with a sharp blade and superhuman abilities. Unable to apprehend this renegade, the Royal Investigation Service (RIS) calls upon the expertise of Keith Flick, a seasoned, yet eccentric detective who was relegated to the Archives Department following a personal loss. As crimes in Cremona begin to escalate, from stealthy executions of...
Full details on MyAnimePulseFrequently Asked Questions
Where can I watch B: The Beginning legally?
Right now, B: The Beginning is on Netflix. 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 B: The Beginning on Netflix or Crunchyroll?
It's on Netflix in at least some regions. Crunchyroll is worth checking too since they carry a huge anime library.
Is B: The Beginning 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 B: The Beginning.
Can I watch B: The Beginning 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.