Two women, having discovered their boyfriend's obsession with BDSM, head to a promised location to repay his debt. However, what awaits them is an unexpected turn of events. Suddenly, their bodies are touched and they are forcibly stripped naked. Clothespins with bells attached are clamped onto their nipples, and they are ordered to shake them to make noise. This marks the beginning of a harsh training session beyond anything they could have imagined.