In ancient Japan, Katsumi is a small boy isolated in a fishing village on a remote island. His life is peaceful and happy until he suffers a series of painful experiences.
A gift from a stranger seems to hold the answer to his troubles, but it leads him to a problem far bigger than he could have imagined.
When a plague of evil demon fish invade the island, even the Mountain Lord grieves and the island seems destined for a dire future. Katsumi is certain that the gift he received from the stranger and this turn of events are linked, and that he is the missing piece of the puzzle, but with the Shinto kami watching his every move, will he live, or will he learn?