A warrior. A rogue. A saint. And an alchemist with skeleton arms? Every ten years, throne seekers compete to become the four heroes destined to slay the Witch threatening their world. Optimistic young alchemist Agni eagerly sets off to fulfill her dream of being one of these sacred heroes. She expects to save the world...and maybe make some friends along the way. But she soon realizes that nothing is as straightforward as it is in her childhood stories, and becoming a hero may come at a terrible cost.