: This is the "label" or "series" prefix. In the Japanese entertainment industry, these four- or five-letter codes identify the production studio or the specific thematic series the video belongs to.
When encountering files with this naming convention on the internet: HUNTB-396.mp4
: When content is sold or shared digitally, the file name often retains this product code to ensure users can identify the content without needing a descriptive title. Safety and Security Note : This is the "label" or "series" prefix
: This is the sequential volume number within that specific series. Why You Might See This File Name including cast lists
: These codes are used by collectors and database websites (like R18 or JAVLibrary) to index metadata, including cast lists, release dates, and director information.