NERCON IS A GUY WHOS PURPOSE IS TO RETURN EVERYONE TO THE ZERO WORLD WHERE THERE IS NOTHING, INCULDING NO FEAR OF DEATH. HE IS NOT TRYING TO KILL EVERYONE BUT MAKE THEM FORGET DEATH. HOWEVER THE ZERO WORLD WOULD BE SO BORING YOU WOULD WANT TO DIE. IT WAS DUE TO KUJIS ACTIONS THAT HE DESCIED THE TIME WAS RIGHT.