The first location where Elena and Tomoe were going to raid was an abandoned mansion of a rich businessman. This mansion was located about 2.5 km away from the city and in a remote location where no one else lived. This was used as a vacation house but later on that businessman lost all his properties. He did try to sell this mansion off but no one was willing to buy it.
Later he did manage to sell this property off but no one knew to whom. That new owner also did not take care of the mansion and soon it became a ghost of its former glory. Many people had mostly forgotten about this piece of property by now. But it looked like this unknown dark organisation might be using this as their base.
Elena and Tomoe both hid their presence while approaching the mansion. From just a look one would find this place to be empty but that was not the case. Tomoe and Elena both could sense that this place had people inside and their numbers were also not low.