A long time ago, there was a job called a sealer who seals out evil demons that harm people. Tachibana Sakunoshin, a traveling fugitive , succeeds in confining Byakuranmaru, who is said to be the strongest monster cat Byakuranmaru, becomes a thousand evil bills, and while rebelling, he will go on with Sakunoshin to exterminate the demons. Byakuranmaru, had a terrifyingly evil heart, but through the battle, his heart also changed.