Carmine, a dragon from an unnamed realm, navigates two intertwined timelines. In the God Chapter, his mother perishes among 21 dragons slain by Japanese forces in 1990 Hokkaido. Riko, a vengeful human girl, salvages his cracked egg, names him for his crimson scales, and raises him covertly at her school refuge, intending to weaponize his power against humanity. His accelerated maturation unveils the dragons’ sacred mandate: defending humans from demonic incursions. As an adolescent, he gains speech and shields Riko and Sergeant Sagara during a demon attack, though Riko falls battling the Demon King. Three centuries later (Demon Chapter), aged and renamed Vermillion, he bonds with Rulishia, a girl who steals his horn, forging a magical tether. They dominate the Ryuto tournament, a dragon-combat arena, leveraging his tactical brilliance, mastery of martial arts, firearms, and azure flames—symbolic of dragons’ holy duty to purge demons. Their alliance evolves from pragmatic necessity to mutual loyalty as Rulishia relinquishes her vendetta. When demons resurge, Vermillion marshals draconic forces to confront them, though the conflict remains unresolved. Carmine’s journey spans fragile hatchling molded by tragedy to battle-weary guardian haunted by duty. His shifting rapport with humans—from Riko’s manipulation to Rulishia’s camaraderie—mirrors a fraught yet enduring pursuit of coexistence amid endless strife. The unresolved finale underscores cycles of sacrifice and legacy, leaving his destiny suspended between war’s echoes and fragile hope.