Aria is a volatile girl who wields two pistols and two swords and holds the highest rank in assault studies at a high school for young mercenaries. This pint-sized prodigy swoops in to save her classmate Kinji from a high-speed chase, but he ends up saving her after he switches from a boring wimp into a total hot shot! His secret? He only turns into something of a James Bond when he's turned on!

Convinced Kinji's an ace, Aria strong-arms him into being her partner - but she isn't the only femme fatale who wants a taste of his coveted combat skills. Aria gets Kinji for one mission, but he'll end up with more than one finger on his trigger!