it was an anticlimactic ending, but nevertheless it was a fun ride. the concept of this manga was verrryyy goooodd in my opinion, and i really like the male lead portrayed in this story (Mirai), he have a good heart. that made me think the ending should be better. but, again, we can't satisfy everybody, that the justice has been served bc if there's no humanity, there'll be no crime thus nobody's got hurts, then elimination of the humanity will do justice for themselves. so, i'll respect the authors' decision for the finale.