Shachou! Watashi wa Anata no (Dansou) Hisho desu.

Usui Rei was looking for a high-paying job to help repay her father's debts when a mysterious man made an offer with a salary too good to be true. He wants Rei to dress up as a man to be the secretary for his son in order to help his son overcome a fear of women. However the son Minato turns out to be rather arrogant and unpleasant. Rei's life as a male secretary is just beginning!