A seemingly pure girl hiding a fierce masochistic heart—the sow bitch known as Sow 9. A 23-year-old swimming instructor at a fitness gym, she has a boyfriend but remains unsatisfied with their sex life, unable to forget the intense pleasure she once experienced with a former athletic, sports-club-type man. In her daily life with her current partner, she feels no attraction toward his penis, instead seeking sexual gratification only during the times he's absent. Though she feared being caught, her desire for self-destruction grew uncontrollable, and she filmed herself, losing all sense of tomorrow's responsibilities as she screamed until morning, "Make me feel even better!" She keeps her pussy constantly open, exposing her lewd, ahegao expressions, eager for you to savor every moment. Her deeply masochistic nature intertwined with dissatisfaction toward her boyfriend creates an intensely compelling scene that will shake the viewer's soul.