A moga heiress is the newest headmistress of a "haunted" rural girls' school, where she plans to scientifically debunk the rumors of ghosts and demons while solving the mysteries of disappearances and violent...

By some sort of fate, exorcist Xiao Yu is forced to "cohabitate" with the succubus named Obsidian, who killed her adoptive father. Yet she discovers that the succubus seems to have lost her memories...