Aria The Scarlet Ammo aka Hidan no Aria is a Japanese light novel series written by Chugaku Akamatsu and illustrated by Kobuichi. As of December 2014, 19 volumes have been published by Media Factory under their MF Bunko J label. Aria is a volatile girl who’s top dog in assault at a school for young mercenaries. When she discovers her classmate Kinji’s an ace, she strong-arms him into being her partner, but she isn’t the only femme fatale who wants a taste of his combat skills. His secret? He’s only a hotshot when he’s turned on! Aria gets Kinji for one mission, but he’ll end up with more than one finger on his trigger!