The most common method, as outlined in community guides, is to search for the product code directly on (like Google) and adult video aggregator sites (like Avgle, JavHD, etc.). You would type "FC2-PPV-4450104" or "fc2ppv4450104" into the site's search bar to see if it has been uploaded there. These sites act as large libraries of content sourced from various platforms, and your target video's code is the only reliable way to find it.
: Genuine "exclusive" content requires an FC2 account and point-based currency, which is the platform's way of verifying age and processing payments securely. fc2ppv4450104 exclusive