Touru sees an advertisement on TV for the national amateur band competition, "Rydeen" and decides that he wants to win it and get a chance to debut as a pro musician. His best friend Hiroshi doesn't seem too enthusiastic about the idea, however.
Touru asks his dad to build him a drum machine for the band, but he instead builds a general purpose robot named Staddue that tends to take things both too literally, and too personally...