Let Me Call You Father-in-Law (2016)

Daidoji Tamotsu is a 51-years-old man. He decides to marry his girlfriend that is 28 years younger than him. One day, his girlfriend, Hanazawa Miran bring him home to meet her dad, Hanazawa Kiichiro. Tamotsu and Kiichiro are shocked when they found out that they are the same age.