Gun-toting, sword-wielding, pig-tail haired, Butei (an armed detective) extraordinaire Aria H. Kanzaki, has just proclaimed that the hapless Kinji Tohyama is to be her slave. Kinji denies this vehement request, but agrees to accompany her on a single case regardless of how big or small it is. Unfortunately, that one case turns out to be much bigger than anything they could've ever imagined. Now, Kinji and Aria must face their own troubled pasts and the painful reasoning behind their individual life choices. Action, mystery, and drama combine in this exhilarating, and poignant, volume of Aria: The Scarlet Ammo!