A number of terrifying experiences take place in a school! The mysterious incident "The Day You Were There" at a closed-down alma mater, "The Day of the Dead" in which an older sister in despair after losing her only living relative, her younger sister, and a former teacher standing in a school building just before it was demolished. A former teacher stands in a school building just before its demolition. What is the abominable event he had sealed away ?

The root of all evil lies in Chuunibyouji (eighth-grader syndrome). Every delusion, crime, and psychic phenomenon in this world began with chuunibyou-sickness. The dark energy of chuunibyou-sickness, causes the craziest incidents.