This one-shot is contained in a book called 7 Ways to Become Absolutely Beautiful (Omoikkiri Kirei ni Naru 7 Nana -tsu no Houhou) (思いっきりキレイになる７つの方法).
Additional information about this book is as follows: No one will call you ugly again!; You'll become beautiful and score a fabulous love!!; Because this is a collection of super techniques to make you absolutely beautiful!
(Source: ShoujoMagic)

Komori Yui lives her life together with six brothers (by father's side). However, it is not the common daily life! In fact is quite a radical life, she is oppressed by them, and blood is demanded, as they are all vampires!