Four girls were gathered at their abandoned alma mater after being abducted. Before they knew it, they were half-naked with bells on their nipples. This was the place where a boy who had been bullied by girls during his school days set up a 'Pregnancy Ghost Game' for revenge. Furthermore, the boy tampered with the lock so that the girls couldn't escape the classroom on their own and released two sex beasts inside. The sex beasts were trained to react to sounds and immediately insert themselves upon catching prey (the girls). The girls carefully tried to avoid making the bells on their nipples ring as they moved around the classroom. Who would be able to escape the classroom within the time limit… And who would spark the bully's grudge inside her vagina?
