Shortly after receiving the title of Hero and getting sent on a quest to defeat the demon king, Able learns from his mother that he is a half-demon. Originally determined to fufill his role, he doesn't know what to do now. To continue his quest, but risk being persecuted later if the humans learn of his demon heritage, or try to make peace with the demons after he's already killed so many of them. For now he continues his quest, trying to shed as little demon blood as possible while he tries to sort out his feelings.