I've seen that there are no reviews out for this yet so I decided to write one on my own.
So basically Koori Zokusei Danshi to Cool na Douryou Joshi follows the lives of co-workers Fuyutsuki and Himuro. They have a really cute relationship, that made me go "awww" quite some times so far. It's just super wholesome. Sadly the chapters are pretty short, but that does not change the fact that this manga is a great read, especially for in between.
Also the further you get into the manga, the more characters appear and we get to get a deeper insight into their relationships.
The art is pretty good too in my opinion, some panels really make my heart melt (read it to get this reference :3)
Overall, if you are looking for a light-hearted, cute and wholesome short manga this is a must-read for you!