Sonnan ja Nee yo

A high school girl named Shizuka Maku is considered average in appearance, overshadowed by her handsome older twin brothers who are popular at school. Boys who show interest in her are often driven off by her brothers, who are overly protective. She is the only unremarkable member of her family, and her brothers have suggested she may not be their blood relative. As a result, they give her an ultimatum: choose one of them to be her boyfriend.