A girl rescued the spirit wolf, one of the four beasts. From the moment she rescued him, and used her clear black eyes to see through his sadness hidden under his blue eyes, he remembered this encounter and will never forget it. When the memoryless spirit wolf is captured back to the devil world, what kind of wave will the girl set off in the devil world? What is the girl's identity? Members of the five major families in the demon world will also appear one after another...