I remember the plot but I forgot the title but I remember I really love that manga/anime! ^^

The plot is that, there's a group of guys living in a mansion but because they don't have enough money to pay for the rent, their landlord makes a deal with them that when she was on her trip, they have to turn her niece who loves horror, spooky stuff into an elegant lady.

So can you guys help me?

I've been searching for this since two weeks ago. T^T