>>45537
Think about it. Maribel can see borders. Yukari can see and manipulate borders. Maribel wears a very similiar dress to Yukari, and resembles her except that she has shorter hair. Maribel Hearn is named after Lafcadio Hearn, who in turn was an American who settled down in Japan, changed his name to a Japanese one, and wrote accounts on Japanese culture and mythology, to the point that he basically established the image of Japan for the west. Maribel is a foreigner to Gensyoko, settles down there, becomes Yukari, and essentially establishes Gensyoko as we know it by creating the massive border.
It does require a bit of time traveling, but that should hardly be a problem for a lady that laughs into the face of the space-time continuum.