The film was written and directed by Keiichi Hara based on the novel by Masao Kogure.
The Japanese cast includes Kazato Tomizawa as Coo, Takahiro Yokokawa as Kôichi Uehara, Naoki Tanaka as Yasuo Uehara, Naomi Nishida as Yukaki Uehara, and Tamaki Matsumoto as Hitomi Uehara.
Factory for their previous pickup of the Summer Days with Coo film.
Plot Concept: From acclaimed director Keiichi Hara (Miss Hokusai, Colorful ), one of Japan’s leading animation talents, comes a heartwarming summer adventure.