Naoko grew up in a normal, peaceful family. After graduating from junior college, she married her first love from her school days. They had a child and lived a happy life with both husband and wife working. However, as her husband's company grew and his income increased, he began to spend more time partying out at night. Naoko's dissatisfaction only increased as she wanted to have a child soon. Feeling on the verge of a neurosis, she decided to consult an older man in the neighborhood who had always been kind to her... and that was the beginning of a forbidden relationship.