Summer Days with Coo

Kouichi Uehara (Takahiro Yokokawa) finds a small Kappa, Coo (Kazato Tomizawa), alive after more than 200 years and carries him home to his family. They hide him in the house while Coo asks the boy to help him look for others of his kind, somewhere in Japan with no people. Keiichi Hara sets the search in a modern suburb, where one visible creature could cost the family their ordinary life and leave Coo alone.