The last survivor of the ninja family Koukagawa, Asuka Koukagawa. She seeks revenge against those who slaughtered her clan and pursues Edwin Black while purging dark forces indiscriminately as the "Steel Reaper." One day, a man named Takuto Ishiyama, who enjoys seducing women and turning them into flesh slaves, teams up with Black's subordinate, Oboro, and takes complete control of the academy Asuka attends. Takuto captures Asuka and modifies her limbs to be as sensitive as a clitoris, then proceeds to train her！！
