Maiden Machine Assault,愛嬢機姦VI ダークマスター -完全強制絶頂調教 – 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.