Phantasy Star II is the second installment in Sega's acclaimed Phantasy Star series and serves as a sequel to the original Phantasy Star for the Master System. Phantasy Star II takes place 1,000 years after the events of its predecessor and follows the journey of a government agent named Rolf and his friends, who are on a mission to discover why the protector of the planet Mota, Mother Brain, has started malfunctioning.