Alien Beasts Devour Humans? I Turned into a Glutton with My Backhand

[Upgrade flow + micro weirdness] The global contract spirit beast, and I awaken as a glutton to feed on the beast No one knows where the alien beasts come from, thermal weapons are useless, this is premeditated genocide. The military activated nuclear weapons, and humans re-established civilization on the land. Hundreds of years passed after this. Have the alien beasts really been wiped out?