The Fandom Post is reporting that Shout! Factory is now streaming the SHIROBAKO The Movie anime film on its own site, shoutfactorytv.com. The film is available for streaming with the original Japanese audio and English subtitles.
The story of the film is described as:
Four years after the events of SHIROBAKO the series, Musashino Animation has gone through unprecedented changes and things are looking bleak for the studio. One day, Aoi Miyamori is offered a role managing a new theatrical animation project. With only a few months left before the deadline, can MusAni complete the project in its current state? It’s up to Aoi to work alongside both familiar faces and new to finish the project in time.
Source: The Fandom Post