Zettai ryouiki (絶対領域) loosely translates into “absolute territory” and is the area of bare skin seen between a skirt and thighhighs. As per usual for fandom who obsess about costumes, this can be considered a moe attribute and thus, present prominently in character designs and schoolgirl outfits. The term originates from Neon Genesis Evangelion to designate an area of Absolute Terror, although it’s had considerable semantic drift. In this case, it may jokingly refer to the fact it emphasizes a shorter skirt without actually becoming creepy and showing the underpants.Oh, well. Blatantly copied from internet again. Basically speaking, there are 3 important parts for Zettai ryouiki; skirt, skin and thighhighs.

Hadouken!