A docile, kind-hearted and lonely young man suddenly started to encounter various monsters and wandering spirits from one day to the next, and the culprits were a sinister and beautiful man with a thousand years of history and his demon cat.
Ever since these two demon kings of unknown origin half-abducted and half-threatened them, they moved into his home, and his stagnant life had undergone earth-shaking changes.
Among the monsters he encountered, he experienced sad, happy, and touching stories one after another, and also witnessed the good and evil of human nature.
Slowly, he opened the knot in his heart that had been sealed for a long time, and finally had the courage to face the bloody and cruel memories of his childhood. But the truth is far from that simple... At the same time, the secret sealed in his eyes attracted demons and demons to fight with each other, and the danger was approaching step by step.