Kono Koi wa Ofureko de!

Mayama had been climbing the career ladder at the company's head office, until he got caught up in an internal dispute and was suddenly transferred to a branch office. His new boss, Nakatani, seemed like a plain, unremarkable man who had only become section chief through years of service rather than talent. One day, looking to unwind, Mayama visits a gay bar where an acquaintance works, only to unexpectedly run into Nakatani. It turns out he keeps the fact that he's gay a secret at work, and at the bar he's completely different from his usual office self, looking confident and strikingly handsome...!?

(Source: Tokyo Mangasha, translated)

Note: Includes one extra chapter.