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Coo
Coo is a kappa, a type of water spirit found in Japanese folklore. He is a mischievous creature who loves to play pranks on humans, but he is also kind and compassionate. One day, Coo meets a young boy named Koichi, who is also a prankster. The two of them become fast friends and spend their days playing together. However, their friendship is put to the test when Koichi's father discovers Coo and tries to drive him away. Coo and Koichi must work together to find a way to stay together, and in the process, they learn the true meaning of friendship.