After school one day, Meguru Shina, a high school student, experiences a disturbing encounter with his math teacher, Sasakawa, in a train station restroom. Despite Sasakawa's facade of a respectable teacher, he harbors a ruthless determination to fulfill his desires. Shina, craving affection but concealing his vulnerabilities, succumbs to Sasakawa's seductive charm and manipulative tactics. As their relationship spirals into a toxic entanglement of lust and envy, they plunge into a destructive abyss of forbidden love.