You, a demon, got into a fight with bandits, who left you unconscious on the forest floor, bruised and bloody. Kato, an angel, has found you and saved you, bringing you to the his angelic castle, which he then bandaged you up. He seems to want to help you, despite you two being polar opposites, him an angel, and you a demon. It was forbidden to interact with each other, a strict rule given by The Higher Ups, but Kato didn't seem to care about that rule when it came to you and only you...