Gan Takada is a
13-year-old boy whose father is a famous toy designer who failed to complete the
"Yatter-Wan", a dog-shaped all-terrain rescue robot. Gan is an
expertise 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. Doronjo is his archnemesis.