The young and pure bodies of schoolgirls are explored by the machines. Struggle as they might, the cold and ruthless rape from the machinery starts to fill them with pleasure... Souta is a regular school boy on a class trip to Kyoto During the trip, he sees his classmate Mana being dragged away by a mysterious robot. Following it, he arrives at a strange and unknown place, and sees something he shouldn't have... Finally, he finds out the secret of the mysterious girl Erika and her master.