The “Absolute Territory”, also known as Zettai Ryouiki (絶対領域), is the bare thigh skin between the skirt and stockings or socks on female and trap anime characters. The Absolute Territory isn’t an exact science, but many experts in the field have dedicated time and effort into studying this phenomenon.
There have been much debate on the ranks and categories, but the chart below is what most scholars have agreed on.
It is important to note that the legendary S-Rank is not pictured in the chart, as it can only be viewed with mother nature’s help. Such help can come in the form of a gust of wind or what we call “The Harem Trip” whereby the recipient just trips out of nowhere and falls into full view of the legendary S-Rank.
Recently, there has been a resurgence in the study and appreciation of what I personally call the “Thicc Overflow“, which is the slight bulge that forms in the Absolute Territory if the benefactor is sufficiently plump, or the clothing are undersized for the wearer. It looks like the skin is overflowing over the sides of the stockings.
Prime examples of this phenomenon are Karen Jinryou from Shomin Sample and, illegally, Kanna Kamui from Maid Dragon. Getting just the right amount of said bulge is critical in the Thicc Overflow, and said amount is still hotly debated between experts and casuals alike.
In any case, here are some examples of glorious Absolute Territory, for your personal advancement and scientific research.