Megaman Star Force takes place in the year 220X, where the world has transitioned to radio-wave technology and is connected through the Wave Road. Subaru Hoshikawa, a fifth-grade student, lost his father in a space accident and now lives with his mother in a small town. He meets War-Rock, an extraterrestrial radio-wave being from the FM planet, who claims to have knowledge about Subaru's father. War-Rock and Subaru merge into Rockman, a radio-wave human with the ability to traverse the Wave Road and fight against the threats to Earth.