Mayo Kinoshita has three extremely good-looking older brothers, each with his own unique personality. The oldest is a working adult who's a bit of an idiot. The middle brother is a hard-core otaku. And the youngest is a narcissistic high school boy. Because of her older brothers, Mayo is distrustful of good-looking guys in general, saying that "handsome guys don't know how hard life is." But then she meets Eo, a fresh-faced good-natured boy in her class, when they are assigned to work together for the school festival....