The next morning after drinking too much at a company party, I woke up to find my coworker Itsukaichi-san standing next to me! She was wearing super sexy lingerie, revealing her outstanding figure that I had never noticed before. Although he is usually a strict guy who points out small details at work, he said "Good morning, you were amazing yesterday♪" in a sweet atmosphere. I don't remember what I did last night... but Itsukaichi-san seems to be in the mood for sex. If I ask her, she will do naughty things at home and at work, and she has become the most convenient woman. Thus began my days of being a cold person at work and a sweet person at home, with a perfect gap between the two.