Strange things are afoot. When things beyond human understanding surface, threatening the peace and leaving behind an endless trail of blood. When such incidents arise, Scotland Yard’s Demon Hunter in residence, John Sinclair, is on the case.

Everyone at school thinks Sousuke is a hopeless military geek, but Kaname thinks there might be something more to him. When their plane is hijacked, her instincts prove correct: Sousuke is a mech-piloting mercenary, and he's here to protect her!