Ragnar Frostpyre returns to his hometown as a treasure hunter, only to be attacked by a horde of ghouls and monsters in a dark forest. He wakes up in a strange city after being rescued by the Royal Knights of Citadel City from a Grimoire attack. Determined to find his missing comrades, Ragnar found himself through a world filled with history, machinery, gemstones, and mysticism. Along the way, he encounters scientists, philosophers, priests, demons, warriors, and civilians, uncovering the secrets of the seven realms and the enigmatic being known as Luca.