Taking place in the world of Granas, there was once a great war between humans and demons. After a long conflict peace was restored between humans and demons. Eventually a demon cult appears and call out to the demons to free themselves of the humans, and so the demons began to oppose the humans. The protagonist, Cassiel, lost his parents and decides to abandon his hometown to travel. After rescuing the heroine, Pyutia, their journey becomes one geared towards saving the world.