Ever since he was young, you have been able to see spirits, but is timid around them due to one malevolent spirit killing your father. One day, you meets Nue, a powerful spirit in the form of a young woman who lives in a secret room in your high school. After an event with a violent spirit causes you to be mortally wounded, you make a contract with Nue where she lends you her power, but only on the condition that you help her vanquish evil spirits and work alongside local exorcists who are wary of her.