Yuuka lives with her retired father-in-law, Toru, at her husband Tadashi's parents' house. Yuuka and Toru, who works part-time while doing the housework, are early risers and are active every morning at 6am. Tadashi gets up at 7am. During that hour, Toru secretly looks forward to watching Yuuka. However, Toru's desire grows, and one day he rapes Yuuka and pours his thick semen deep into her vagina. From then on, Yuuka is creampied by Toru in the short time before Tadashi wakes up every morning, and gradually she awakens to pleasure...