On location at an abandoned school, Mitsu ends up spending the night alone with her cameraman teacher. She's always called him "sensei," and despite having a boyfriend, she's never seen her teacher as a man before. But overwhelmed by the eerie atmosphere and isolation of the deserted school at night, Mitsu grows frightened and asks him to sleep with her. Inside a cramped tent, the distance between them rapidly closes. Under the influence of the heightened emotions—akin to the "bridge effect"—Mitsu's feelings begin to waver, eventually leading them into a physical relationship. Amid tension and anxiety, she ends up allowing him to creampie her. This unexpected turn of events completely transforms their relationship.