Kasuga Eri is a tomboyish 12-year-old girl whose ordinary life changes when two aliens from the planet Mahl turn up to see her. One is Chinpui, a creature that resembles a mouse, and the other is Wanderyu, who looks like a dog. Their reason for coming to Earth is to find the girl who is meant to marry their planet's prince. The TV comedy adapts the manga by F. Fujio Fujiko and runs for 56 episodes.