Summer Days with Coo
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.
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Summer Days with Coo (2007) is a animation, anime, comedy movie running 2h 18m. Starring Kazato Tomizawa, Takahiro Yokokawa, Naoki Tanaka. Rated 7.8/10 on TMDB. Watch it online free on ZapFlix.