Gan Takada is a 13-year-old boy whose father is a famous toy designer who failed to complete the "YatterWan", a dog-shaped all-terrain rescue robot. Gan is an expert in mechanics, and he helps fix his father's dream design. He forms a fighting team with his girlfriend Ai, and names himself "Yatterman No. 1". His weapon of choice is a kendama, which he uses as a flail and grappling hook as well as for his special attack "Kenda-Magic", a zapping attack.