Last Monarch immerses gamers in a world where you are the demon lord Kuro, tasked with protecting his family. Armed with your unique abilities, capture and trap others as you make your way through the treacherous 2D rogue-lite shooter. As the last devil, it is your responsibility to ensure the survival and continuation of the demon race. Your journey begins outside the castle walls, where you will meet different tribes, personalities and character traits. Captured traits will help you protect your fellow creatures while accumulating buffs and improving your skills and abilities with the items you find.