Riria, a female college student living alone with her sick mother, starts working part-time at a convenience store to pay for her tuition. One day, she impulsively uses store money. Overcome with guilt and desperate to repay it, she's introduced by the store manager to a loan shark, only to be trapped by outrageous debt terms and forced into performing. She agrees to appear in the underground organization's "Public Continuous Orgasm Experiment Show." On stage under the gaze of a crowd, humiliation and pleasure intertwine. Her exposed genitals are projected on screen, she is restrained and tormented, and her vagina is repeatedly filled with large amounts of semen.