Ojou-sama wa Oyome-sama.

Towako is the daughter of a wealthy family and is about to turn 18. Since childhood, she has been told that she must marry the man who was born on the same day, at the same time, and in the same year as her. When they first meet, Yuuga is unkind to her. Now, she must deal with the situation as her future husband turns out to be a reserved and distant young man.