Also known as Yamato Nadeshiko Shichi Henge (Perfect Girl Evolution).
The first post wasn't very clear with the description, but it pops into my head straight when he mentioned a dark girl living with 4 handsome boys.
I guess there are not many stories like that. Lol.
It's a very interesting and funny story. It's about a girl who was hurt once by her crush when she tried to confess (he said she was ugly (that's chapter 1 itself, so no spoiler)) and turned into an anti-social horror-loving girl who doesn't care about looks anymore. Worried about her, her aunt (the Marie Antoinette of the East lol) decided to make a deal with 4 handsome tenants living in her mansion; if they managed to turn her into a 'lady', the rent will be free. Otherwise, it'll be doubled (if I recall correctly).
You won't be bored. Really. Lol.
Anime: 25 episodes
Manga: Ongoing
In the anime version, there's an ending. So I doubt they have a sequel.
I find anime is funnier because of Hiroshi (the anatomical mannequin). Lol.