Board Thread:Questions and Answers/@comment-90.176.7.225-20140520182401/@comment-75.18.255.142-20140930005001

TIME IS IRRELEVENT IN THE WORLD OF THE AFTERLIFE! The main purpose of the world the class of SSS were in was to have a allow them to be able to move on with no regret. I assume that since Kanade was there so long and showed no hope of leaving the afterlife, this system needed to solve this problem by bringing Yuzuru into the equation.

Another theory is that this is not the same Yuzuru that died in the real world. This Yuzuru could have been a fabricated copy created by the world in order to remove Kanade. It would be sad if it was.