Four adult women are abducted and brought to their abandoned former school, half naked with bells attached to their nipples. A man they bullied years ago has created a revenge game in a locked classroom, releasing two sex beasts trained to react to sound and immediately penetrate any woman they catch. The women must move carefully without ringing their bells and survive until time runs out—but whoever is captured will face forced sex and a creampie driven by his long-held grudge.