The Managing Director is Chasing After Me

Miho is a 28-year-old office worker who is uprooting her whole life and moving to the countryside from Tokyo in order to change who she is. The night before she leaves, she meets Osamu, falling for him instantly, and they spend the night together. A few months after she has started her new job, her company asks her to become the executive secretary to the new managing director, who turns out to be no other that Osamu himself! Miho has left her flashy and luxurious ways behind and looks completely different from when they first met in Tokyo, and she is desperate to keep her identity a secret from him. To top it off, she has put in place a strict NO DATING rule, so she is doing everything she can to squash down any feelings she might have towards him... Meanwhile, unaware of her secret efforts, Osamu continues to chase after her with his "Have we met before?" accusations!

(Source: MangaPlaza)