I happened to meet a local girl at the beach on a business trip, and I fell into a summer-long relationship with her, forgetting my wife.

After work, I was standing alone on the beach when you called out to me. A friendly smile and a sweet voice with a Kansai accent. I have a wife. ...But I fell in love with her. Only tonight. A summer's mistake. Please forgive me for my selfishness. This is a record of me having sex with a local girl I happened to meet on a business trip and having sex with her until the morning.