An underground club run by salarymen operates a "confinement training website." This site attracts women with various sexual preferences who desire to be kidnapped and confined, fulfilling their fantasies in a popular, secretive environment. Among them, Mikuru Asahina stands out as a special figure. Initially hesitant and anxious, she gradually becomes accustomed to being teased and played with by the visiting salarymen. Over time, she loses herself completely, eventually choosing to actively desire and seek out the men on her own.