Oh! My Girl (2008)

Yamashita Kotaro was living a peaceful life as a publisher part-timer aspiring to be a mobile phone novelist until two females suddenly appeared in his life. One is his six-year-old celebrity niece and the other is the little girl's stern manager. As he is forced to live under the same roof as the little prodigy, their differences soon manifest and disputes ensue. However, through co-habitation, Yamashita slowly comes to appreciate having a family and the warmth it brings, all the while developing a love-hate relationship with Fuji Mineko, the manager.