Buffalo Seed has no luck catching salmons in the river, so Yakari takes Little Thunder to look downstream, however, once there, he falls in the strong current while trying to save a helpless bear cub. Fortunately, a protective mama-bear saves the selfless Yakari and takes him to her cave, but now, the unlucky boy who suffers from a severe memory loss, can't even remember his name, while in the meantime, Buffalo Seed, Rainbow and Little Thunder are searching for their friend. Will Yakari get his memory back, and most important, will the team find the missing cub?
—Nick Riganas