Ayumi Nonomura and Tatsuki Iizuka, both introverted, find themselves lost on the sprawling campus of Kamizono Academy on their very first day of high school. As fate would have it, they run into the unstoppable Torako Kageyama and her closest confidante, Suzume Saotome. With Torako as their guide (and at times, their motivator), the group of girls navigate the challenges of school, home, and growing up.