We look into the events before the future arc, we follow the story of Zamasu, an U10 kai trainee of Gowasu, as he learns the wise instructions given by Gowasu in order to become an kai for U10. But that all changes when his hatred for mortal beings gets to him, the future position was taken away by Gowasu because Zamasu was too dangerous for the job. But when an future of himself trapped into Goku's Bbody, now nicknamed Goku Black, meets up with Zamasu and teams up with him, Zamasu starts to go down a dark path.
