The title "SSIS-864" is part of the "SSIS" series, which is S1's flagship line for their top-tier exclusive talent. These features often focus on high-fidelity visual presentation (4K resolution) and "full" uncut or extended sequences. of the 4K version or other titles featuring this actress? S1 NO.1 STYLE - NamuWiki
Standard Blu-ray offers 1920x1080 pixels. 4K offers 3840x2160 pixels. This means for every square inch of the frame, the 4K version contains four times the detail. For the SSIS-864 release, which likely features intricate set designs, costume details, and close-up shots, this extra resolution brings out textures that are completely lost in lower resolutions.
