The story takes place in 1700’s Northern Japan after the war. A boy, after getting attacked by some strange monster, escapes to the nearby village where Ayane lives and warns the villagers that the monster is approaching. The village residents start trying to find a way to protect their village. Meanwhile, Ayane’s brother has a conspiracy to control the monster and use it. As the story goes on, we find out exactly how the monster was created and the cruelty some humans are capable of.