Drinking with a colleague I'm not good at leads to a one-night stand at home. The penis and vagina are so compatible that I experience the ultimate climax... I don't like it at all, but we have sex again. (Kominato Yotsuba START-257)

Yotsuba and Yuta, colleagues, dislike each other due to their completely opposite work styles. One evening, Yotsuba misses the last bus to a client's dinner party and has no choice but to stay overnight at Yuta's house. While drinking, the conversation shifts from work to vulgar topics... the two begin to belittle each other, until suddenly it escalates to "You try saying that!?"—an unexpected development...