A Dungeon Monsters' Point of View

It seems like a classic story of worlds turned into RPGs. Portals open and pour out streams of monsters or open onto Dungeons. Windows appear in the air and describe people's abilities in mysterious numbers. Killing creatures gives experience points… And in the midst of all this aberrant madness, it's not the story of a classic hero we follow, but of someone who encounters them and really wonders: how do you defeat these cheated monsters? Regressors, former Isekai, characters with overly advantageous skills... What can a prisoner of the Dungeon do to ensure the victory of her people in the face of such threats? Will she even succeed?