"Ochi Mono RPG Seikishi Luvilias" follows the story of Knight Luvilia as she valiantly stands against a sudden demon invasion threatening the peaceful human world. After confronting the Demon King Vois and the Demon God Tia, she is defeated and claimed as Vois's property, enduring intense and overwhelming stimulation. As the battles continue, Vois strengthens his forces by adding his succubus younger sister Ilis and the voluptuous young witch Lufilia to his team, setting the stage for further dark and erotic confrontations.