In the Desolate Continent, Ardyn, a young man transmigrated from Earth, possesses infinite memory and perfect control over spiritual energies. Starting as a knight, he discovers a hidden book detailing the long-lost path of the magi, the "Living Sun." Keeping his abilities concealed, Ardyn saves his family during a calamity caused by the Emperor's suspicion. Uprooting the royal family, he places his father as the new Emperor, while he acts as an ancestor, continuing his quest. A tome reveals his inheritance from a late Breaking Dawn Magus named Eternal Sun, urging him to visit the magus world when he reaches rank 4. There, Ardyn allies with Leylin Farlier, saving the Oruburos Clan. United by their quests, their intertwined destinies shape the tapestry of fate in two worlds.