The filename follows a naming convention typically used for high-definition video content distributed in split archives. File Name Breakdown

: It uses RAR compression to reduce the footprint of the raw video data during transfer.

: Confirms the video resolution is Ultra High Definition (3840 x 2160) .

: Usually a volume or catalog number within that specific series.

: Provides 4K clarity, which requires a compatible monitor or TV to view at native quality.

: This is likely a specific production code or series identifier (often associated with Japanese adult media or specialized high-end digital releases).