Three years prior to the beginning of the story, a village was destroyed by an evil Smarg (magical creature). The sole survivors of the massacre, the sisters Chloe and Iria, fled to a nearby village. The younger sister, Chloe, is mute. However, she is a friendly and diligent worker who is loved by all. The older sister, Iria, is disruptive, rude, and cruel, especially towards her unfailingly loyal sister. But, how did two young girls manage to escape such a powerful creature in the first place?

Haizuka just wants to live a normal life, a peaceful life far away from all the trouble he's faced. But as soon as he starts highschool, an encounter with a girl and a strange creature destroys any hope of a peaceful life.