Aria the Scarlet Ammo

To combat rising crime, Japan establishes Tokyo Butei High, a specialized school where "Butei"-armed detectives-train to become skilled agents of justice. Among them is Kinji Tooyama, a withdrawn former student of the Assault Division who now keeps a low profile in the logistics track, hiding his formidable but awkward hidden ability. His quiet life shatters when he’s targeted by the notorious "Butei Killer" and crosses paths with Aria Holmes Kanzaki, a fiery, top-ranked prodigy. After witnessing Kinji’s true potential, she saves his life and insists he become her partner, dragging him back into the dangerous world he tried to leave behind.