Mirei, a busty married woman, goes out shopping when she is approached by suspicious men offering her a chance to test health equipment as a monitor. She is eventually lured into a studio, given a vibrator, and locked alone in a room to try it out. As she watches AVs broadcast on the monitor, she becomes aroused and starts masturbating. The staff catch her in the act, leaving her unable to explain herself. Helpless and overwhelmed, she is pressured and gradually succumbs to pleasure, ultimately receiving a generous creampie.