He reunites with his childhood friend Yuu, who he had been estranged from due to their respective marriages, on a business trip to Tokyo. They have a great time talking about old times, but the bar closes early due to shortened business hours. Then Yuu suggests, "If you're on a business trip, you're staying at a hotel, right? Let's buy some alcohol and have an after-party!", setting the stage for a full-blown relationship! As expected, they become a couple! They're both embarrassed, but their sex is shockingly compatible. They kiss each other intimately, take baths together, and have a relationship that has lasted for over a decade...Once they do it, they can't stop, and they meet up secretly and cum inside each other many times during the three days of the business trip...