University student Suzuka openly states "money" as her reason for participating, yet she expresses doubts about the CD's content. The next day, dancer Reina joins, declaring her motive is "pure pleasure." With differing reasons for appearing, both women are asked to listen to the same CD. Initially skeptical, Suzuka puts on the headphones—and within minutes, her legs spread wide, her hips begin to sway, and she starts moaning in helpless ecstasy. Moving in rhythm with the audio, blindfolded Suzuka screams as she repeatedly reaches climax. Watching closely from the side, Reina begins to feel changes in her own body.