The Sannomiya couple has a painful problem: the husband's low sperm count makes natural pregnancy almost impossible. Fertility treatment is expensive, and his despair turns into cruelty toward his adult wife Tsubaki. When neighborhood chairman Oshima invites her to a meeting, she is subjected to humiliating acts disguised as fertility treatment. But the fierce pleasure is unlike anything in her dull marital bed, and both her mind and body begin to change.