Yuki Ryu and Hayachi Enton were university classmates, with Hayachi being three years older than Yuki. Although both were already in relationships with other people, a flirtatious, ambiguous tension persisted between them. One day in August, Yuki invited Hayachi out for a meal to seek advice on job hunting—a conversation during which Yuki repeatedly flirted with him. Yuki complained that her boyfriend lacked ambition and was sexually inadequate, while Hayachi confided that his own girlfriend was emotionally distant and had already secured a job in another city, leaving him unsure about the future of their relationship.

After the meal, they wandered through a shopping mall. Driven by intense, pent-up desire, the two ended up satisfying their urges in a mall restroom. Due to heavy traffic in the city, they decided to pass the time by strolling through a nearby park. Once the rush-hour congestion had eased, Yuki headed back to her university dormitory, while Hayachi returned to the apartment he rented near his workplace. While in the park, they discovered an abandoned building and decided to explore it; inside, they engaged in a passionate, illicit sexual encounter.