Hiroki and Chigusa are secretly dating at work, as Hiroki doesn't want to mix business with personal matters. Because everyone around them thinks they're both single, there are many conflicts between them, which leads to their first big fight. The next morning, Hiroki acts as if nothing happened, but Chigusa is angrier than he expected... She leaves a spare key behind and leaves, and they meet again at the office in an awkward atmosphere...
