Bijin Dorobou

Shinonome Mizuki is a popular and stylish girl. She's also dating the coolest guy in school, Satoru-kun. But, Mizuki has a secret. She actually has a very plain face and has to wake up at 5:00 am everyday to make herself into a stylish person! However, her secret is in danger of being exposed when the son of her father's company manager, Odagiri Rin, comes to her house. Due to complications, they have to live together!

(Source: Shoujo Crusade)