This is likely the "Product Code" or "ID." In many international media markets, especially in East Asia, studios assign a four-letter prefix to a series, followed by a chronological number.
Understanding Media Metadata: Decoding "nsfs112subjavhdtoday020733 min" nsfs112subjavhdtoday020733 min
An acronym for "Japanese Adult Video." This identifies the genre and the country of origin. This is likely the "Product Code" or "ID
The transition from titles like "Summer Vacation Memories" to "NSFS-112" represents a shift toward database-first organization. For collectors, these codes are essential for: Keeping digital folders sorted numerically. especially in East Asia