

After her father moves abroad, she is forced to live in a mansion with six mysterious vampires. The heroine of the franchise and the player character. Voiced by: Rie Suegara (anime) (Japanese), Maggie Flecknoe (English), Vanessa Olea (Mexican Spanish).

Vampires Are Sex Gods: All the vampires are good looking, and their blood sucking can easily be seen as an analogue for sex.Took a Level in Kindness: They soon started to become nicer in each of their endings, though it doesn't always work well.Though she later can turn into a vampire herself in some endings, making this subverted there. Interspecies Romance: Yui with any and all of the male vampires she meets in the franchise.If they're tremendously ugly, Fangirls wouldn't even be drooling over them. Cast Full of Pretty Boys: Obviously, since it's a female-focused franchise.Brooding Boy, Gentle Girl: All the boys are the sadistic and abusive Brooding Boys while Yui is the gentle, sweet, kindhearted, and forgiving Gentle Girl.Bastard Boyfriend: As a masochist series, most of them act cruel, taunting, and forceful to Yui, which is supposed to be their "Do-S" appeal.

Most boys are only interested in her blood but they may genuinely come to love her in some routes.
