Kotomi had been anticipating a pleasant summer holiday. That changed when she discovered a note in her bedroom. Containing highly intimate and exposing details about her, Kotomi is compelled to obey the note's directives and head to the abandoned school building. Upon arrival, she realizes she is not alone. Several of her classmates, including the stubborn Miyuki, are also present. However, when everyone is abruptly locked inside the structure and girls begin to vanish, it marks merely the start of the horror. A narrative of violence, perversion, and lust, featuring explicit sex and unconventional sexual fetishes!