Rainbow Waltz(2009)

Nanairo no Enbukyoku

Shizuka is a normal girl, enjoying her life with friends and family. Unknown to her, her life is about to change overnight! She becomes an heiress to a large family corporation, and has to adjust to living a very different life than what she is accustomed to. Along her new path are seven men, each either handsome, charming or plain mysterious. How will these men impact her life? Will Shizuka ever get used to her life? What would life be like if you became a princess overnight?

(Source: DMP)