Rome no Yogorenaki Hanayome

Real estate magnate Renzo was shocked when Esther, an American woman he had never met before, told him she was pregnant with his child. According to her, Renzo's ex-wife had asked her to be a surrogate for them but then told Esther that she didn't want the child anymore after she and Renzo divorced. Now Esther's come to Renzo in distress. Renzo is intrigued by the idea of having an heir, so he decides to have Esther act as his pretend fiancee. Gradually, however, he becomes fascinated by her innocence... (Source: Renta!)