The couple had been married for three years and their relationship was going well, but the wife went to a class reunion and met her ex-boyfriend there. Unlike her kind husband, she was invited by her ex-boyfriend, who had a frivolous personality, and she ended up going with him to a love hotel. Of course, she feels sorry for her husband, but the sex with him (her first sexual partner) became even more passionate. Although she thought it would be fine if it was just sex, she created an alibi while her husband was away on a business trip, and the relationship developed into a full-fledged affair.