For those who have downloaded the Kekkaishi Manga here the chapter 52 was posted twice as 52 and mislabeled as chapter 53, i did some searching and found the missing chapter 53 on one of those read manga online sites and saved and zipped the pages and then i uploaded them to a filesharing site called zSHARE. so if your missing the real chapter 53 here it is

http://www.zshare.net/download/31058653cb6caa/

later