Yuko Masuda, 34-year-old CEO's wife. With a voluptuous female body and a fearless aura, she enjoys training men who suit her taste, especially in recent times when more men are becoming passive. As a dominant, aggressive woman, she brings out male virility through strict yet alluring guidance. Her true nature is deeply masochistic—she craves being humiliated and played with, her massive breasts and huge ass teased and dominated, as she pursues the ideal sexual fulfillment. In her world, obedience is demanded, and within it, men awaken to a new version of themselves.