From Chibi Manga:
The story of a first-year junior high school student Honda Non. One day, the three princesses of “Kokona Kingdom” Allen, Ciel, and Kira were transferred to his school… !! The three princesses: Allen, Ciel, and Kira were very popular at the school!

But one day Non Kun accidentally touches Ciel and Kira's chest. But in their country there is a rule that says that, “If a man touches the chest of a woman she has to marry that person” ... suddenly Non Kun is bethrothed to become a handsome prince ? What a super dream! Let's see what happens next !