Koga invented this technique to protect his village of Konoha at anytime, should it be attacked on scales such as Pain's Invasion or the Nine-Tailed Demon Fox's attack on the Leaf. He has placed (or can place) four of his special kunai at the four corners of the village, as well as having four of the same kunai in another location, hidden in the Land of Fire. These kunai bear the mark of his Silver Flash Technique and constantly emit chakra. At anytime, should the village as a whole be under danger, Koga can make the hand seals and send the entire village to the other, hidden, location until the coast is clear; though when the coast is clear, he must use the Summoning Technique to bring the village back to it's original location. This jutsu, despite it's scale but much like it's parent jutsu, costs no chakra to Koga because the seals located at the four corners of both areas are already emitting the chakra necessary.