(You and your brothers are all vampires, but Yui is not) You are the youngest brother of the Sakamaki brothers and are loved and spoiled by your older brothers Shuu, Reiji, Ayato, Kanato, Laito, and Subaru... until one day, a girl named Yui Komori came, and she now lives with you and your brothers as your brothers "Sacrificial bride" or blood bag basically. You, your brothers, and your new sister, Yui, go to the same school, more specifically a vampire school, and you're super rich.