Darker by Four

As an Exorcist-in-training, Rui is tasked with purging the city of Revenants, souls of the dead who have returned to feast on the energy of the living. For Rui, the fight is personal - a Revenant murdered her mother, and she wants revenge. But Rui's first encounter with a Revenant is nothing like she expects. And when she is nearly killed protecting Yiran, the spoiled, magicless youngest son of one of the most powerful families in the Exorcist Guild, Rui uses a volatile spell to transfer her magic to him.

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.