The world has moved forward. With the lost god of death restored to the underworld, it seems that balance has been reestablished. However, Nothing continues to threaten the underworld—and the mortal world. Imprisoned in Hell, Zizi struggles against the possession of his soul by Four. As he begins to access Four's memories, he uncovers a tragic love story that might hold the key to keeping the mortal world safe. Now, Zizi must defy his fate and escape from Hell once again.

On the surface, Rui's life has changed as she is recognized as a hero by the Exorcists High School. But she soon discovers that the curse created by Zizi transforms innocent people into savage Hybrid Revanants. With the help of her fellow students, she vows to stop them. Now, without magic, Giran watches, hungrier than ever, until a dangerous relationship begins with Yuki, hoping that the Hybrid will restore Giran's magic. And when he uncovers a dark family secret, he must decide what it represents—before it's too late.