Sakura Shunin wa Z Sedai ga Wakaranai.

Sakura is a Millennial who's already been divorced. Despite being the chief of the sales department, he struggles to build a working relationship with Aoi, a new Gen Z employee. One day, while working late, Sakura decides to relieve some stress in private, only to be caught in the act by Aoi! The next day, as Sakura considers quitting out of embarrassment, Aoi surprises him by doing the same thing in front of him to stop him from leaving!

(Source: Kaiohsha)