: This format (three letters followed by a hyphen and numbers) is most commonly used as a product code or content ID for media releases, particularly within Japanese niche film or adult entertainment industries.
: This likely refers to a release date (2021) or a specific duration/minimum timestamp within a digital file. Contextual Significance pred680 karen yuzuriha un021947 min 2021
: This is likely a secondary catalog number, possibly for a specific distributor, digital platform, or archival system. : This format (three letters followed by a