Young Taro lives in a suburban apartment with his wife. Upon hearing that his stepmother, Izumi, will be visiting from the countryside this weekend for sightseeing, his heart begins to race with anticipation. It has been since New Year's two years ago when he last saw her. Now in her mid-forties, Izumi radiates a mature, alluring charm that Taro has always been acutely aware of. This weekend, she is scheduled to arrive at their home, arms full of souvenirs, for a four-day stay with three nights. Just imagining her arrival makes Taro's heart pound uncontrollably.