In the realm of Hidan no Aria AA, Butei students wield weapons, tackle crimes, and resolve mysteries. Aria Kanzaki, a top-notch S-rank student at Tokyo Butei High School, stands out among them. Contrasting her excellence is Akari Mamiya, an E-rank freshman who adores Aria but struggles to excel in her Butei endeavors. Despite her shortcomings, Akari dares to seek Aria's mentorship as her assistant, facing doubts from her peers. To Akari's surprise, Aria offers her a challenging test, which she bravely undertakes and surprisingly passes. Yet, Akari's journey to becoming Aria's official assistant is fraught with hurdles, demanding her unwavering dedication to prove her capabilities. Will Akari's aspirations materialize, or will setbacks hinder her progress, and can Aria guide this underdog from obscurity to triumph?