Summer Days with Coo

In a quiet suburb of Tokyo, fourth grader Kouichi Uehara stumbles upon a remarkable discovery: a fossilized baby Kappa, a creature from Japanese folklore, long buried beneath the earth for three centuries. Naming his newfound companion Coo, Kouichi soon finds their bond blossoming into a deep friendship as Coo becomes part of his family.

As Coo attempts to adapt to the modern world, he faces the challenges of fitting in among humans while yearning for the company of his own kind. This heartwarming tale weaves together themes of friendship, discovery, and the struggle between tradition and the contemporary world, inviting viewers to explore the enchanting blend of adventure and mythology that unfolds in the warmth of summer days.