Fashion elite couple living in a luxurious Minato Ward high-rise apartment, Honoka and her husband. Honoka works in the apparel industry, while her husband is employed at a renowned overseas brand. Outwardly, they appear to be the perfect couple, but their actual relationship is strained. Due to their busy work schedules, they rarely eat together, seldom go out on weekends, and their intimate life has become infrequent—causing their marital bond to weaken day by day. Sensing her husband's emotional distance, Honoka suspects infidelity, which is later confirmed. Devastated, she begins to escape reality and soon finds herself entangled in a passionate affair with a complete stranger.