Misaki Kato's a chubby girl who started going to the gym to change herself. That's where she runs into her boss, Ryohei Kuraki, who's dubbed "the boss from hell" at work. They talk and he assures her he'll give her confidence, right before he boldly makes his move!! She can't resist his muscular body and smoldering gaze... Friends with benefits or not, there's no going back after she finds out how good he makes her feel...!! Misaki's heart is racing at work and at the gym! A secret love story between a strict but handsome boss, and a girl who's plain and chubby.