While practicing for their choir, two female students attempt a new vocal training method. This extreme technique involves receiving powerful belly punches, pushing their bodies to the absolute limit. One brutal punch after another lands with unimaginable force, driving them past endurance. Even after the session ends, the tension escalates into a heated verbal fight, quickly erupting into an intense battle. Gut punches and groin strikes fly as the confrontation reaches an unexpected climax. A grueling training session unfolds into a shocking, visceral showdown.