Six years have passed since Aki married her older husband, and her sexual relations as a couple have ceased, which has left her feeling lonely. One day, Aki learns that her husband's boss, Sagawa, is in the same situation as his wife. Then, after her husband falls asleep, Sagawa and Aki are drinking alone and talking about this, and he ends up embracing Aki. It's been a while since Aki has been held by a man other than her husband, and although Aki hesitates, her body responds. From then on, the two begin to have secret sex on days when her husband is not around...