On his way home, a young man passes a pet shop and, spotting a kappa in the window, decides on a whim to buy it. He brings the creature home and names him Kaatan. Since he has never owned a kappa before, he relies heavily on a book he purchased about raising and training them. The book provides several good tips for bringing up a smart and well-behaved kappa, and the process seems very simple. Unfortunately, putting these techniques into practice and actually making them work is not quite as easy as the book implies. Kaatan seems to understand things at first, but usually ends up either forgetting what he has learned or simply not being interested in learning in the first place. However, this particular young man has a lot of patience and continues his possibly fruitless effort to raise Kaatan into a pet he can be proud of.