Following Oorai's victory over Saunders, the school's next opponent is Anzio. This is an OVA which covers the battle of Oorai versus Anzio, which was not fully shown in the regular anime series.

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!