

A small, lone Kappa miraculously survives over 200 years into modern day Japan, when he is found by young Koichi. Coo, who is secretly adopted by Koichi's family, searches with his new human friend for unpopulated places in hopes of finding any remaining of his kind.

Kazato Tomizawa
Coo (voice)
Lead
Takahiro Yokokawa
Kouichi Uehara (voice)

Naoki Tanaka
Yasuo Uehara (voice)

Tamaki Matsumoto
Hitomi Uehara (voice)

Ken'ichi Nagira
Coo's Father (voice)
Nanako Hirata
Koichi's Classmate (voice)

Kyousuke Ikeda
Koichi's Classmate (voice)
Kazuki Matsuoka
Koichi's Classmate (voice)
“A staggering achievement of craft and ambition. Keiichi Hara's vision lands with breathtaking precision.”
“Every frame feels alive. Summer Days with Coo is the rare release that takes its audience seriously.”