Otometeki Koi Kakumei Love Revo!!

As a child, Hitomi Sakuragawa won beauty contests. Over the years, the junk food her fans kept giving her accumulated, and so did the weight — all the way to 100 kilograms by her second year of high school. When she and her brother move into her father's large dormitory and she discovers that the school's most popular boys have also just moved in, the shock is finally enough to start the diet she has been avoiding.