The school's most beloved and adorable student, known for her strong sense of justice, tries to protect her homeroom teacher from a gang of delinquents who were about to assault her. As retaliation, the delinquents turn on her and lock both her and the teacher inside the school storage room. They are threatened: "Have sex with your precious student and record it as proof—otherwise, you'll both stay locked up here forever." Trapped together in this dangerous situation, the student and teacher are forced to confront each other under mounting tension and fear. As anxiety and suspense build, their relationship begins to shift in unexpected ways.