Synopsis
Potomas the Hippo hides a secret: he can talk like a human, but only the young kids Maki and Toshi know about it. He also wears a bright green T-shirt with a big letter "P" on it, meant to stay unobtrusive. Forgetting to keep quiet for a moment, Potomas speaks to a child he has just saved from drowning. Rumors quickly spread about a hippo that can talk, forcing Potomas to go on the run.