After losing her husband in an accidental death years ago, Yuu, who moved from Tokyo to the countryside, is now considering remarriage. Upon hearing this, her father-in-law grows uneasy, recalling an old village custom once practiced there: "A widow becomes the sex slave of a bachelor family." Long-suppressed desires begin to surge within him at the mention of her remarriage. His emotions spiral out of control as he declares to Yuu, "My dear Yuu... I won't let you go to anyone else...!!"