Kekkonshiyou = Let's get married.
TN: They're playing a word game called shiritori, where you have to reply with a word starting with the last kana in the previous word. In this case, the kana is "u"....You have to start with "u"...?Un = Yes
You lose the game by saying a word that ends with the kana "n", since there are no words that begin with it, making it impossible to go on.Yes! You lose, Sanya!