Ryu Enami's ordinary life with her husband is disrupted when her former boss, Moriyama, suddenly visits and humbly asks to borrow money. Sympathetic, she lends it to him on the spot. A year later, Moriyama returns—not just to repay the debt, but to ignite a new chain of events. As the married woman Yuko faces his aggressive advances, the story spirals beyond the boundaries of daily routine into a whirlpool of shock and desire.