In a high-end underground club in Tokyo ruled by a dominant mistress, days of obsessive submission unfold with male slaves. Regular patrons constantly engage in challenges, losing large sums of money before leaving defeated. The mistress maintains close ties with her staff, yet always devises new forms of oppressive play when VIP guests arrive. Does she truly desire men? During idle moments, she grabs hold of employees, demanding penetration. But when a high-paying guest shows up, she's once again drawn into a fresh battle. Natsuko, who has repeatedly rejected the advances of a masochistic male client, must now decide how to respond to his persistent desires. At home, Natsuko transforms from mistress to submissive woman, exploring bold new dimensions of sexual passion.