One Eyed Ghoul

There was a time when ghouls and humans co-existed together, but this year's ghouls are more thirsty for blood so they decided to attack Tokyo city at night. leader of ghouls Aogiri (one eye ghoul) is highly skilled in Number theory, he made a plane that every ghoul must be separated by some distance whose values match to a Pythagorean prime number. But, fortunately, this information was le