The strongest Onmyoji in history, who mastered Onmyodo and commanded numerous Youkai, died in a burning mansion after being betrayed. Wishing for happiness in his next life, he attempts a reincarnation technique before his death. The technique succeeds, but he finds himself reborn in another world! Four-attribute magic? He doesn't need it. His mastered Onmyodo and the powerful Youkai he sealed in the other world remain under his control.