On the verge of marriage, Yumie Watanabe visits her childhood home. Though she had confirmed contact, she senses no one is there and heads into her old room. Inside, she finds the space transformed into something resembling a private prison cell. "Wh-what is this!?" she gasps in shock, only to sense a man's presence behind her. Without a word, he approaches and coldly declares, "There are things I need to investigate." Paralyzed by the sudden turn of events, Yumie can't move. A full-body rope inspection begins immediately. Coarse hemp ropes dig lewdly into her soft, plump skin, tightening with each twist. Strangely, she finds herself drawn into the sensation. A relentless, no-questions-asked training session unfolds.