After drinking with a coworker I don’t like, I ended up having a one-night stand. His size and fit were so perfect that I experienced the best climax of my life… Yotsuba Kominato.

Co-workers Yotsuba and Yuta have opposing work styles and are uncomfortable around each other. One night, Yotsuba misses the last train after a business meeting and ends up staying at Yuta's house. While the two of them are drinking, the conversation turns from work to dirty talk... As they get worked up and start to insult each other, an unexpected development occurs: "If you say so, why don't you try it!?"