After a marital fight, my sister-in-law, Yuko, leaves her home. She seems troubled and at first struggles to speak, but as the alcohol flows, she begins to open up. She confesses, "We're in a sexless marriage." As it turns out, I'm in the same situation, and our shared frustration quickly leads us into a physical relationship. Yet Yuko's desires grow deeper and more intense—stealing moments in the bathroom, the closet, even right beside my sleeping wife. I'm tormented, my reason and body pushed to the brink, yet I continue to satisfy her relentless cravings.