Dragon Girl and the Dungeon

A legendary dragon awakens from his ancient slumber, only to find himself sealed inside a human corpse by the very people who disturbed his rest. Humanity, driven underground by nuclear devastation, now wields terrifying superpowers born from radiation—powers that make even a dragon think twice. To top it off, a fierce dragon girl shadows his every move, her sword always ready: "Step out of line, and your head rolls." Stripped of his former glory and trapped in a fragile body, can this once-mighty dragon survive in a world where humans have become the apex predators?