The product identifier refers to a highly popular and critically acclaimed release from the premium Japanese adult entertainment studio S1 (No. 1 Style). In the AV market, the addition of the 4K designation signifies a remastered or native ultra-high-definition presentation, delivering four times the resolution of standard 1080p Blu-ray discs.
The film is famously structured to push physical limits. After initial solo scenes, the actresses gather to subject a single male performer to a relentless, three-way "woman's assault," before the action escalates into a four-person scene involving three actresses and one actor (3-on-1). [6†L9-L10] During a YouTube video after filming, Yua Mikami admitted that the physical toll of this production was significant. She revealed that upon seeing the script, she was daunted by the prospect of a 4P scene, saying, "It's not that I dislike 4P, but I really can't keep up with the physical demands anymore; I get too tired." [6†L9-L11] SSIS-698 4K