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At the café bar "NONKI," the five people who used to work part-time at this shop during their student days were gathered as usual. Although they have all turned 25, when they meet at the shop, they liven up and have a great time just like old times. Kosuke is one of the sales representatives who has been working at an advertising agency within a venture company. As usual, when the five of them gathered, Sanae calmly started talking about how her boyfriend, whom she had been dating for eight years since high school, suddenly brought up the topic of breaking up. Asumi, who is lovey-dovey with her boyfriend, Naoki who works at a supper club, and Kazuma, who is one year younger, each carrying their own little confusions, but when they meet, they liven up as always, the five of them. On the way back, Sanae decided to walk home with Kosuke. Sanae had always felt uncomfortable around the flashy atmosphere of Kosuke, but as they talked, she confessed that she still doesn't understand the value of sex during their 8-year relationship. "Shall we try it together now?" Kosuke's unexpected words pierce through Sanae, who ended a long relationship at the age of 25.