Riko Kumiyoshi is a 29-year-old lawyer in her second year of marriage, with no children. Despite her professional status, she is under her husband's command to secretly film herself having sex with other men. She points the camera at herself and documents her affairs with men other than her husband like a personal documentary. During filming, she receives physical stimulation, struggling to suppress her moans, muttering "no, no, I don't want this" repeatedly—yet her body betrays her as she can't hide her erotic responses and begins to pant uncontrollably. When her soaked pussy is penetrated by a man's cock, she gives in completely, whispering, "I'm sorry, but I'm actually feeling pleasure." Overcome with sensation, she starts recording explicit self-confessions on camera. Afterward, when she reports back to her husband, he tells her there's still more he wants her to do, urging her to continue. Then, she performs masturbation on camera for the first time in her life. As she grows desperate for another man's cock again, she writhes and screams in ecstasy, climbing toward intense orgasmic heights.