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Summer Days with Coo (2007)

Genres: Animation, Fantasy, Comedy, Romance, Drama, Family

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 as Coo (voice)
Takahiro Yokokawa as Kouichi Uehara (voice)
Naoki Tanaka as Yasuo Uehara (voice)
Tamaki Matsumoto as Hitomi Uehara (voice)
Ken'ichi Nagira as Coo's Father (voice)
Nanako Hirata as Koichi's Classmate (voice)
Kyousuke Ikeda as Koichi's Classmate (voice)
Kazuki Matsuoka as Koichi's Classmate (voice)