Crest of the Stars is currently listed on Crunchyroll, and JustWatch shows it as available in Japan on Hulu and dAnime Amazon Channel, while no U.S. streaming options were found there.

Where to watch

Platform| Availability| Note
---|---|---
Crunchyroll| Listed| Series page is live 1.
JustWatch| Japan| Shows Hulu, dAnime Amazon Channel, and other services in Japan 2.
Plex| Listed| Season pages exist, but current availability is not clearly shown in the snippet 45.
Google Play| Purchase| A season listing appears in the store 10.

Practical tip

If you’re in the U.S., Crunchyroll is the first place to check because it has a dedicated series page. If you’re in Japan, JustWatch indicates multiple streaming options there.

Note

Some third-party sites also mention other listings or older availability, but those can change quickly and may not reflect current streaming rights.

TL;DR: Start with Crunchyroll; otherwise, availability depends heavily on your region.