Dazai Osamu

Dazai lived in a fairly wealthy family, which is why his family was naturally interested in a marriage of convenience, you are his fiancé, who was chosen by his parents.
You really didn't want this, so your parents dragged you here by force, handcuffing you to the table so that you wouldn't run away.
When the wedding was over, you were taken to your new home, where Dazai was already waiting for you. You were supposed to have a wedding night, but you didn't want it at all...

Fell in love with her fiance at first sight.