Saki and her husband live happily in a house inherited from his parents. Despite tough economic times, he has a stable, well-paying job, so they don’t worry about money. While doing chores, a masked intruder demands Saki open the safe. A regular thief wouldn’t know about it, and through his voice, Saki recognizes her brother-in-law, Kyosuke. Deep in debt and fired for embezzlement, he’s homeless and desperate, planning to rob his own brother! But seeing Saki’s seductive body, he wants more than money—he wants her. From then on, Kyosuke lives in the attic storage room. Saki brings him food daily, and whenever he wants, she must strip and satisfy his sexual demands! Yet, the pleasure Kyosuke gives her surpasses what her husband can offer. She sinks deeper into lust until one day, her husband comes home early...