Chou Shinuchuu yori Ai wo Komete

"I want to know more about you, the one who found me in this infinite universe." Due to the trauma of her middle school days, Ten Teradate distanced herself from others at school. But one day, Lulu, a princess from a faraway planet, arrives and announces that she will become Ten's bride, and Ten's quiet and lonely school life is drastically changed... (Source: Ichijinsha, translated)