Kappa no Kaikata

A young man passes a pet shop on his way home, and seeing a kappa in the window, decides to buy it on a whim. He brings the creature home, and names him Kaatan. He's never owned a kappa before, so he relies heavily on a book he purchased on the subject of raising and training kappa. The books gives several good tips for bringing up a smart and well behaved kappa, and it all seems very simple. Unfo...