Kake kara Hajimaru Sayonara no Koi

With her stern efficiency, Nao Yoshinaga is known as the Ice Iron Lady of the company. One day, she overheard colleagues making a bet with Satomura that he could make Nao fall for him. Unbeknownst to them, Nao has had a secret crush on Satomura for all this time. The bet could turn out to be her best chance!

(Source: Micro Magazine-sha, translated)