Kato and Yumino joined the company at the same time; usually, people like that become close, but these two are like water and fire. Yumino constantly criticizes Kato's work attitude, messing up the data but not bothering to fix it, thinking about drinking all day. It’s true that you get what you hate. Once, during a company outing, Kato got so drunk that he didn't know anything anymore, and Yumino had to take him home. Unexpectedly, while drunk, Kato saw Yumino's butt exposed, and he forcefully took over her body. In fact, Yumino had liked Kato for a long time, so seeing him take the initiative like that made her think that Kato liked her too. Little did she know that the next morning, Kato completely forgot everything that had happened. However, seeing himself naked while Yumino was only in her underwear, Kato guessed what had occurred...