Elite Hisho ni Amaku Semararetemasu

After the death of her parents, Hinoko had a hard time raising her two younger brothers while working as a paralegal. One day, a handsome man named Chihiro, who claimed to be a secretary for the Mochizuki Group, a large corporation, came to visit her at work. He told her that the president of the Mochizuki Group has passed away and that Hinoko, his granddaughter, will inherit his vast fortune and the position of president of Mochizuki Group. Chihiro seemed so businesslike toward the surprised Hyuuko, but then he suddenly kissed her...? This is the start of a dramatic love story in which Chihiro is tossed about by the sweet courtship of a cool, elite secretary!

(Source: Comic Berry's, translated)