Kurushima Iori lives in a world in which humans and half-beasts coexist peacefully. After an accident kills the last pair of Japanese wolves, their son Riku is left an orphan in the care of Kurushima's department. Deciding to care for him personally, he moves them to a small town where the only other Japanese wolf lives, a male writer, in order for Riku to learn how to live as a wolf.