One day, Koichi picks up a large stone on his way home from school. When he washes it clean, a young Japanese mythical water creature called,‘Kappa’jumps out with a “ coo”sound. It explains that it had been lying under the ground for several hundreds of years. Koichi and his family adopt the creature, naming it Coo. Koichi and Coo become good friends and spend joyful times together when suddenly Coo says that it wants to return to its world where its own Kappa friends lived. Koichi and Coo set out on a journey to find a place called ‘ Dono’where the Kappa legend still exists, but to their disappointment, they are unsuccessful and return home to be greeted by a group of reporters. Eventually their warm and idyllic summer vacation takes a drastic turn. Base on the three part series written by children’s literature writer, Kogure Masao, this film combines two part of the series:‘ Kappa oosawagi’and‘ Kappa bitguri tabi’, to create this animated epic feature for theatrical release. The film which took the director, Hara Keiichi five years to finish, was a project he wanted to make for the past 20 years. (Chun Jin-su)