Kappa no Kai-kata: How to Breed Kappas

Konami's PlayStation 2 Kappa adventure game, based on the TV anime of the same name. The story takes places in Showa 40 and follows the story of a young boy named Hiroshi, who's forced to spend his summer at his grandparent's house. Hiroshi's grandparents have these green, prank-prone creatures called Kappas, and you earn your keep by raising them -- teaching them manners, guiding them and so-forth.