Girls enjoy masturbating while watching close-up shots of their own underwear on a monitor. Soon, masked chairs attack them in various ways. Though embarrassed, they can't help but respond to the stimulation. Desperate to climax, they struggle intensely, but reaching orgasm isn't easy. Even after coming once, it's not over—relentless attacks continue. Six girls, including the petite beauty Mika Sonohara, are depicted orgasming for real. On the verge of collapse, this is the domain of the Mask Man.