Shizuka Maku is merely an ordinary high school girl with looks that are only slightly above average. This wouldn't be an issue, except that her older twin brothers are the school's heartthrobs, making her appear plain by comparison. The only boys who have ever shown interest in her are driven away by her overprotective brothers. As the only plain member of her family, her brothers have now suggested that she might not be related to them by blood. Consequently, she is expected to choose one of them to be her boyfriend.