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.

The first film in Shin-Ei's series of annual WWII themed anime television movies for children "Sensou Douwa"