Kake kara Hajimaru Sayonara no Koi

Overview:

Nao, who is expressionless and strict at work, is known as the "ice-iron woman". One day, Nao’s senior colleagues make a bet on whether they can make her fall in love and enlist their junior Satomura. Nao overhears their plans, but decides to play along… because she’s been in love with Satomura for years!