Summer Days with Coo
Summer Days with Coo , Kappa no K to Natsuyasumi? , lit. Summer Vacation with Coo the Kappa is a 2007 Japanese animated film about a kappa and its impact on an ordinary suburban family, directed by Keiichi Hara.
A small, lone Kappa miraculously survives over 200 years into modern day Tokyo, Japan when he is found by young Koichi. Coo who is secretly adopted by the whole family, faces a tragic past and the presents challenge of living in a dramatically changed environment, searches with his new human friend for places not invaded by people hoping to find any remaining of his kind. When this intelligent water spirit draws the popular attention of the whole city upon being discovered and then confronted with his past, it forces him to take action and make an ultimate decision, in order to preserve his kind, inner peace and well being in todays harsh world.
Source: Wikipedia