A supernatural anime series following protagonist Amaya Hirayama and her older brother Jin.

When Jin tried to scam the devil out of a deal, he was turned into a half-demon as a punishment. His religious parents tried to kill him, but he fled when his little sister, Amaya, provided a distraction. When night fell, Amaya fled her childhood home and went looking for her brother, finding him in an alleyway after a bit of effort. Since then, all they have had is each other.