On the way to school, Kokubu Karin, a junior-high school student, finds a piglet too hungry to move, so she feeds it. This pig is actually Prince Tonrariano III from planet Booringo. He gives Karin a transformation kit, consisting of a piggy nose, to reward her kindness. Karin puts on the nose and says the magical words that Tonrariano III taught her, to transform into the…