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Synopsis
Potomas the Hippo hides a secret: he can talk like a person, but only the children Maki and Toshi are aware of this. He also sports a vivid green T-shirt with a large letter "P" on it, though this is meant to be discreetly low-key. After briefly forgetting to stay silent, Potomas speaks to a child he rescues from drowning. Word quickly gets out about a hippo that talks, and Potomas has no choice but to flee.