Diabolik Lovers: Haunted Dark Bridal

At the behest of her father, Sakura Haruno goes to live in a secluded mansion of the Ōtsutsuki Clan, home to the six roommates — vampires. Though at first the are confused as to why the girl has arrived, they soon realize that she is to be their new "sacrificial bride," not to mention their other, more carnal intentions for her. (Vampire AU/Sasusaku)