Yu and Haneda are colleagues who are secretly having an affair. Being both married, they cannot spend much time together. Desiring to be with each other and have sex all day long, Yu and Haneda decide to lie to their families about going on a business trip. Several months later, the day of their 'business trip' arrives. They go to a hot spring hotel and passionately make love. Haneda feels Yu's sexual desire is stronger than usual. It turns out that due to her husband's job transfer to Fukuoka, she has to follow him, causing them to be apart for a while. Knowing this, Haneda feels sad and disappointed, so Yu uses sex to cheer him up. However, Yu still occasionally lies about going on business trips to meet Haneda. A year later, she decides to tell her husband the truth and give up everything to be with the one she loves...