Kiriko lives with her husband and son Koichi. The reason why she has a good long married life is "sex". Her husband was satisfying her Kiriko's libido almost every day. ... One day, her husband goes on a business trip. Moreover, the timing was bad and Kiriko was waiting for her period in a few days. Kiriko has been worried about her sexual desire increasing abnormally before her period. And then, Kiriko unintentionally motions the courier who visits her house...
