...wait, what? I thought the modern Japanese archetype of yandere was originally devised by Araki subverting the "yamato nadeshiko" archetype in the character of Yukako Yamagishi-- I can understand it took off in ero-manga, but I didn't think it originated from there.
Well enough, I'm not the Japanese person here, or the mangaka, or the ero-mangaka-- but still.