Natsume, a wife who lives with her husband in an apartment owned by her father-in-law, Tatsunori, usually helps out with cleaning and other tasks. One day, while working in Tatsunori's room, Natsume gets tired and falls asleep. Tatsunori sneaks up behind Natsume, smells her hair, and starts touching her body. When Natsume wakes up, she sees that her father-in-law is not the usual gentle man he is, but a beast-like man with a burning desire!