Nei You Equan Qing Xiaoxin

An exorcist named Xiaoyu ends up living with Heiyao, a succubus responsible for her foster-father's death. Heiyao appears to have no memory of her past. Suspicious, Xiaoyu decides to stay and monitor Heiyao, who is content with the arrangement and attempts to entice Xiaoyu to satisfy her needs. Despite frequent conflicts, both are aware of greater threats, including the person who killed Xiaoyu's father, the one who erased Heiyao's memories, and an unknown danger.