30-year-old Fujieda Mamiako. A vibrant, athletic housewife with a radiant smile, she's an active member of a mothers' volleyball team, dedicating herself to the sport daily. Now in her eighth year of marriage, she enjoys a happy life surrounded by her husband and child—until a sudden incident changes everything. She unconsciously finds herself drawn to her team's male coach. At the same time, she becomes aware of the difference between sex for her child's sake and sex that fulfills her own desires, awakening new cravings within her. As a result, she experiences her first affair. From that moment on, her libido grows stronger each day, transforming her into an increasingly erotic woman. Witness her shameless transformation.