Kekkon no na no Moto ni

Briony just became a secretary for company president Carlyle, famous as a workaholic. Just as she finishes an urgent job, a little girl bursts into the office: Carlyle's daughter, Emma. Briony is shocked by the instant change in her boss. The normally haughty man boasts a transformative smile as a proud single father. Briony ends up joining the pair on a trip to the amusement park, when Emma suddenly collapses in pain! Carlyle confesses that Emma has a heart condition, and has only a few months left to live. Not only that, but he begs Briony to fulfill his daughter's final wish-he wants Briony to marry him, and become Emma's mother! (Source: Renta!)