The world has moved on. With the missing death god restored to the underworld, it appears that equilibrium has been regained. But the Nothing continues to threaten the underworld - and the mortal realm.

Trapped in Hell, Zizi fights the takeover of his soul by Four's. As he begins to access Four's memories, he discovers a tragic love story that could be the key to keeping the mortal realm safe. Now, Zizi must defy his fate and escape Hell once more.

On the surface, Rui's life has changed as she is hailed a hero by the Exorcist Guild. But she soon discovers the spell Zizi was forced to create is transforming innocent humans into vicious Hybrid Revenants. With the help of the other cadets, she vows to stop them.

Now magicless, Yiran watches, hungrier than ever, until he begins a dangerous dalliance with Yuki, hoping the Hybrid will recover Yiran's magic. And when he discovers a dark family secret, he must decide what he stands for - before it's too late.