4 girls were gathered at their abandoned school, half-naked, with bells attached to their nipples. This was a place where a boy who was bullied by girls during his student days was planning revenge under the title "Pregnant Chase Game". The boys tampered with the key, releasing 2 sex beasts into the classroom that they couldn't escape on their own. The sex beasts were trained to catch prey (the girls) when they react to sound and immediately insert. The girls carefully escape inside the classroom without making the bells attached to their nipples ring. Who will escape the classroom before the time limit and who will have the revenge of the bully's resentment spark inside their vagina?
