After her husband's company goes bankrupt, Kotone Yamagishi and her spouse move in with her father-in-law, Mineo. Though Mineo welcomes them warmly, he secretly struggles with lustful desires far beyond what his age would suggest. Initially anxious about suddenly assaulting Kotone, he soon decides that instead of worrying, he should take action—and begins devising a calculated plan to possess her. His seemingly kind behavior masks a web of cunning schemes, drawing Kotone helplessly into his manipulative trap. Mineo's lewd desires, far from being a one-time impulse, grow increasingly uncontrollable, escalating into relentless exploitation and humiliation.