The main character, Hitomi Sakuragawa, was once a cute, beautiful girl, winning beauty contests in childhood. However, after losing to the temptation of junk food received from fans, she has steadily gained weight… until she reached 100 kg in her second year of high school.

At the beginning of the school year, the main character and her brother move into her father’s mansion-like dorm. Surprise awaits as she discovers that the school’s most popular guys are also moving in. Their impressions on her, shock her into starting a diet.