Soma has left the forest with Felicia and Sierra to begin the long journey back to the academy. However, that journey will take them through the land of the devils: Dement. There, anarchy reigns and every dispute is settled by sheer power.

Soma encounters a girl there who introduces herself as Stina, daughter of the Dark Lord. Although Soma wants to give her the benefit of the doubt and invites her to join his group, it's clear that she's keeping a dark secret from him—one connected to all the threats he and his friends have faced so far.