It's a gorgeous, spacious mansion, and four handsome, fifteen-year-old friends are allowed to live in it for free! There's only one condition--that within three years the guys must transform the owner's wallflower niece into a lady befitting the palace in which they all live! How hard can it be? Enter Sunako Nakahara, the agoraphobic, horror-movie-loving, pockmark-faced, frizzy-haired, fashion-illiterate recluse who tends to break into explosive nosebleeds...

Even though their landlady reserved a special suite just for Sunako and Kyohei, they opted for a tiny studio apartment. Sunako finds the best paying job available to pay the cheap rent, in the red-light district! When the guys find out they freak. Will the landlady of the mansion allow them to move back in if she discovers where Sunako is working?

Sunako is a great cook, but her croissant recipe needs help. Luckily, the landlady happens to know a royal family famous for its master bakers. Sunako and the gang are whisked off to the small kingdom of Grimmel, but the landlady has ulterior motives: The young prince of Grimmel is looking for a bride, and his tastes are almost as morbid as Sunako's. It looks like Sunako might accept the prince's proposal--unless Kyohei is willing to speak now or...