Succubus Lord Regalia

An adventurer returns from a routine monster hunt when the air itself starts shaking, and out of that disturbance steps the strongest of all monster species: a succubus. Whatever comes next, the source keeps behind a spoiler tag, but the setup alone tells you the hunter is about to become the hunted.

That reversal is the whole premise. A man built for killing monsters runs into the one monster built to unmake men, and the story pivots on what happens when the roles flip.

Combat runs on turns, standard RPGM fare, but the fights aren't really about winning. Losing has its own scenes, its own escalation, and its own point. Expect the succubus and whatever else crosses the protagonist's path to take control more often than not.