From Macaroon Scans:

Risa, 27, who works for an advertising agency, doesn't care about romance and pursues her dream of working. One day, she is carrying her luggage and is about to fall down when someone suddenly lends her a hand. It belongs to Maruyama, who works for the same company. Although he is silent, inexpressive and hostile (the really handsome type), Risa is overwhelmed by the kindness she sees in him. What she doesn't understand is that when Risa works several hours overtime, Maruyama is always there for some reason...