This is a world where humans and monsters coexist. After a war, both tribes were seriously injured, so they agreed to divide the world. There was no major friction in ten years, but the human border was repeatedly plagued. Like other time travelers, he also obtained an old man who was staying in the pendant on his chest. However, his old man was not very reliable. He was wanted by the court and forced to get out of the gate. Naturally, he couldn't get idle when he got outside the gate. He played with the women of the demon clan everywhere, which really made him realize a practice technique called the refining ritual.