Star Man: kono hoshi no koi (2013)

Hirosue Ryoko plays the role of Uno Sawako, a plucky single mother of 3 boys. Due to her personality, fearing that she will be the ruin of him, Sawako's husband takes off and abandons her and their 3 boys. Sawako is left to bring up their 3 sons by herself, with the help of her grandmother. Living an average normal life, one day, Hoshio, a man who is suffering from amnesia, suddenly appears before her. Even though he is much younger than her, Sawako falls in love with Hoshio at first sight. A dormant heart that now has love awakened, Sawako decides to keep Hoshio by her side by telling him, "You are my husband" - Will Sawako be able to struggle through balancing the reality of being a mother of 3 boys with her immature tendre for Hoshio?