Mukuchi na Kare ga Zangyousuru Riyuu

Risa, 27, is employed at an advertising agency and prioritizes her career over romantic interests. One day, while struggling with her luggage, she is helped by Maruyama, a quiet and unexpressive coworker. Though initially appearing cold, his unexpected assistance impresses her. Risa notices that whenever she stays late at work, Maruyama is also present, though his reason for being there remains unclear.