Yuuki Rito has befriended any number of gorgeous women, including dangerous ones like Mea and Yami, "living weapons" with fantastic powers. Even more dangerous, however, is the human weapon known as Master Nemesis: a devious and domineering woman with an agenda all her own. Now, Nemesis claims she's going to make good on her promise to turn Yuuki Rito into her servant! Can he survive her perilous attention unscathed?