Mario sets his sights on Natsume Saya, a strong and popular classmate, tricking her into entering the virtual world of FKVR as a "Heroine." Using his GM authority, Mario rigs the game to strip Natsume of her power and subject her to an overwhelming sexual encounter with a tentacle monster. Though initially horrified by the experience, the intense pleasure leaves Natsume addicted, prompting her to beg Mario for another chance to play.