Facing a surge in criminal activity, Japan establishes Tokyo Butei High, an exclusive school where armed detectives—known as "Butei"—refine lethal techniques with the goal of becoming mercenary‑style guardians of law. The institution aims to produce elite operatives capable of neutralizing threats swiftly and decisively. Among its pupils is Kinji Tooyama, a withdrawn and blunt sophomore who once trained with the Assault Division"s combat‑focused cohort. Kinji now enjoys a relaxed routine, studying logistics to conceal his formidable yet awkward special talent. His tranquil days abruptly end when the notorious "Butei Killer" targets him, and he encounters Aria Holmes Kanzaki—a tempestuous, outspoken prodigy of the highest rank—who rescues him and insists he join her as a partner after witnessing his true capabilities. Partnership signals the rise of a powerful pair.
J.C. Staff Japan