Imako and Ichina share a secret, passionate relationship characterized by risky sexual encounters and a deep physical bond. While Imako finds excitement in the danger of skipping class for intimacy, Ichina is plagued by intense anxiety regarding Imako's association with a delinquent named Tatsuki. After spiraling into a nightmare fantasy about Imako being kidnapped, Ichina is relieved to discover her safety, though he remains deeply protective of the fragile yet bold girl.
After obtaining a mysterious aphrodisiac known as the "Imako System" from a classmate named Tatsuki, Ichina administers the drug to Imako. The substance strips away Imako's inhibitions, leading to an intense sexual encounter that leaves her physically and mentally craving Ichina's touch. As Imako becomes addicted to the pleasure, a secret deal is struck between Ichina and Tatsuki, further intertwining their complicated social dynamics.