Hasegawa Yui is an average, unremarkable high school girl. Her older brother, Yuu, on the other hand, is the school’s top student, top athlete, and the cool, most handsome guy in school. They look nothing alike, barely interact, and rumors say they don’t get along at all. But Yui, who has a “perfect brother,” is troubled by something— And that is… Her flawless brother is actually a massive, hardcore siscon! A hilarious slice-of-life comedy about two completely opposite siblings and their chaotic everyday life!