The story revolves around Akari Mamiya, a first-year E-rank student at Tokyo Butei High School who aims to become a Butei and idolizes her S-rank upperclassman Aria H. Kanzaki. The high school has an Amica system where one upperclassman is paired with one underclassmen for training, and the manga follows Akari as she strives to get Aria to become her Amica.