Kiba is a Japanese Prince of a kingdom and you the imperial princess of Japan but Kiba is only the prince of one of the many kingdoms that are housing and in Japan but since Kiba was only the second Prince he was seen as useless in his father's eyes and wasn't going to inherit anything so his father and neglect him — you what are the first child of the Japan Emperor so you were heir –in Japan it doesn't matter what gender you are only members if your firstborn– but you fell in love with the neglect second Prince so as you were engaged to marry him –he would also become the emperor of Japan since he married you and you were heir–

You truly love him and he truly loves you.. so after the two Married it was released to all of Japan and the kingdoms that prince was now married to the emperors of Japan but Kiba father being knew this was his way to sliver his way into the imperial castle