Tasked with investigating the source of Myastere—a dangerous magical substance seeping into the world from a dark forest—researcher Aaurae=Mawkish arrives at the site on behalf of the Kingdom's Royal Special Relics Investigation Department. The high concentration of the miasmic material has driven local wildlife into frenzied violence and rendered modern technology inert, while a criminal outfit called Deazniff actively plunders the ancient ruins now exposed by the contamination. Descending into underground chambers that reveal remnants of a long-lost civilization, Aaurae discovers enigmatic artifacts from a mythological age—including a revolver and wire—that seem to respond to her presence. As the mystery deepens and Myastere's influence spreads, she remains unaware of a shadowy force lurking beneath the surface: the Holy Order, an organization erased from official records and lost to history.