Kiriko lives with her husband and son, Koji. The reason their long marriage has been so successful is simple: "sex." Her husband satisfies Kiriko's sexual desires almost every day without fail. ... One day, her husband goes on a business trip. Worse still, Kiriko was about to start her period in a few days. She had long been worried that her sex drive would become abnormally high before her period. Then, Kiriko couldn't help but make a move on the delivery man who visited their home...
