Keiko, a woman in her thirties with children. Her daily life is consumed by child-rearing and work, leaving no time for herself. Amidst the repetitive days, she falls in love with a married man at her workplace. The more she thinks it's wrong, the more her feelings burn. They end up having an affair. The two of them become deeply addicted to the pleasure of doing something bad. However, she decides that this time will be the last.
