Located high in the mountains, the hamlet of Kadono enjoys apparent tranquility thanks to the piety of its priestess. To maintain this delicate balance, Jinta, a formerly wandering boy who, along with his little sister Suzune, has joined the hamlet and is now its protector, is dispatched to the forest frontier to hunt down evil entities. After a fierce battle, the latter reveals a terrifying prophecy... For the demon hunter in search of understanding, this interaction marks the beginning of a journey through time, guided by the edge of his sword.