Asuhara Yuuko, a beautiful and intelligent teacher leaves a prestigious school in the city to work in a rural school. She has a troubled past as a victim of stalking at her previous job, so she transferred to escape and start fresh in her new workplace. The new school, unfortunately, has Narimiya Keisuke, the protagonist, who possesses an evidence from Yuuko's past that she wants to forget. He develops a dark obsession with Yuuko and begins to use her troubled past to manipulate her. Keisuke disguises himself a fictitious blackmailer and gives her obscene orders using pictures from the fake blackmailing website. His orders escalate, and soon the entire school becomes involved in a debauched and immoral affair.