When Masahiro decides to open a bar, he asks his daughter-in-law Keiko to stay for about a week and help with the preparations. Still fiercely lustful despite his age, Masahiro has long had his eye on her body. That night, he takes advantage of a heavily intoxicated and defenseless Keiko, sexually toying with her body. She wakes the next morning regretting what happened, but Masahiro now has leverage over her and forces her to obey. From that day on, she is trapped in a humiliating ordeal with no one coming to her rescue.