Synopsis
Sanpei lives in the beautiful countryside with his grandfather. His schoolmate calls Sanpei a “river goblin” because of how he looks, but in reality, Sanpei is never a good swimmer. One day, while he is sneakily practicing for the swimming competition in the river, he is caught in the muddy stream. When he gains his consciousness, he realizes that he is now in the land of goblins. Sanpei makes friends with Gartalow the river goblin who looks identical to Sanpei, and they decide to escape the land of goblins together and return to Sanpei’s village. When they find out the traces of Sanpei’s missing mother, their great adventure to the Mount Deamonshead begins…