After marrying, KAORI lives happily with her husband. One day, she notices her father-in-law, Ginji, standing motionless in front of the house after returning from shopping. Feeling sorry for him, she decides to let him stay overnight. The lustful Ginji begins showing affection toward KAORI, treating her with increasing kindness. Before long, he starts secretly watching her intimate moments with her husband. Claiming it's for KAORI's own good, Ginji takes special actions when they're alone together during the day. This incident leaves a deep mark on KAORI's heart, profoundly challenging the bonds of marriage and the nature of family relationships.