Sasotta no wa Socchi desho: Joushi to Buka, Megasametara Love Hotel deshita.

Nao and her boss, Seiya, get along about as well as a cat and a dog at work. When they go out to drink with coworkers, they get in a big fight... or so Nao thought, but when she woke up, she was in bed with him at a love hotel! The next day Nao doesn't know how to act in front of Seiya at the office... but when they talk, they get in another big fight about who invited who to the love hotel... that leads to them kissing again. And then he says, "If we repeat that night, we'll probably remember..." Nao knows that's just an excuse, but she can't resist... (Source: Renta!)