Congratz to the translator to sticking with it.
It looks like the cliche end is closing in, possessed friends returns to a enemy HQ, MC recovers and together with the army launch a assault on it, then probably inject some virus or his soul into the trooper control station and breaks it worldwide.
That or for some reason the aliens (or whatever) main HQ was in that city and it uses a hive mind with a queen, kill the leader, all done, possibly with a atomic self destruction.