Amakuro Joushi no Okiniiri - Otona no Honki ni Torokasaremashita

The perfect boss's sweet desire to have her all to himself. The company's new employee, Emika Kushige, is feared by her coworkers and is having a hard time fitting in because her father is a member of the board. The only thing that brings light into her lonely life is her boss, Seishiro Toyama. Staring at him alone is enough to fill her with joy. He's good at his job, popular, alluring, and extremely handsome. Which is why Emika is secretly in love with him. But, everything in her life is turned upside down when she lies to her father and tells him she has a boyfriend. She has no choice but to ask Seishiro to pretend to be her boyfriend, but when she does, he starts acting like a completely different person. Seishiro seems to have been keeping a big secret of his own!