Set in a world of despair and loneliness where everyone turns into a demon, the phantom thief Megitsune operates in the shadows to restore hope. She has fully mastered the bizarre technique of "vaginal breathing," an unnatural art that allows her to absorb life force and semen, drawing in demon flames to ignite her own fire. Infiltrating a mansion in search of an ancient secret medicine, she finds herself trapped in a deadly trap. Yet her seductive powers bewitch the men around her, luring them into repeated creampie torture sessions through vaginal breathing, draining them until they collapse. Her motto is "full speed ahead!"—depicting her merciless, relentless nature as she pushes forward until one of them falls.