Former actor Mito Yusuke has spent years searching for the truth behind the mysterious death of his beloved wife, a teacher at the prestigious private boys’ school Mankai Academy. Believing her death is connected to an incident she had been investigating, Mito conceals his identity and infiltrates the school as a teacher.

One day Mio attends a middle school reunion and is reunited with her first love, Shuichi. Her love is rekindled when the guy approaches her, but they get caught up in an incident where members of the reunion start dying one after another.

Subaru is investigating the death of of a enemy, Kaneyama but before he died, he undertook a project, which was how to teach seven teenage girls how to use black magic to get revenge on people they don't like, but when one of the girls feels remorse, she is told by the other girls to continue with the black magic. Subaru tries to stop them but the girls think that he is their enemy and put a curse on him.