Yukiko is a young wife who feels lonely and unsatisfied. Her husband Koichi does not meet her needs, and they actually sleep in separate beds. Adding to her frustration, Yukiko discovers pictures on her husband's cell phone of an unknown naked woman; also, one night she sees her two children—who are not related by blood—together in bed. Yukiko spends her time at home trying to satisfy her needs on her own. Until one day, her husband's father comes to visit and catches her in a compromising situation. That is when things in her family start to change…