Magical Marriage Lunatics!!

Yuuta is just your typical guy who enjoys an ordinary school life with his childhood friend Yuuna. Suddenly one day, a mansion appeared in his backyard, inhabited by the vampire princess Luce. One by one, other other-worldly princesses came to him, all of whom had made a childhood promise to be his bride when they grew up. He didn’t remember the promises, but then Yuuna also joined into the fray a…