In the previous work (SDAB-317), Mizuho-san was dating her boyfriend who dreamed of becoming an AV director and had sex with another man, and the whole thing was filmed. One day, while browsing social media, I discovered Mizuho-san's doujinshi AV. This work was made by buying the footage from the contributor and re-editing it. In it, Mizuho-san was seen allowing a man she'd just met to cum inside her as he told her, and once again becoming absorbed in it.