In a realm of magic and blades, the valiant warrior Tia Allbright and her bumbling companion, Luke, engage in fierce combat against demonic assassins in a mystical realm. Armed with her enchanted sword 'Grandeek,' housing a guiding spirit, Tia voyages to the enigmatic Marcleida island. Despite initial setbacks, Tia persists in her quest, seeking entry past the vigilant barriers while a mysterious figure arrives with a covert agenda. Murders plague the island, orchestrated by a phantom killer able to materialize at whim, linked to the stolen sword 'Aihorn' seeking retribution for its fallen master decades ago. As Tia infiltrates the island, a dual pursuit unfolds for the coveted Aihorn, each aiming to halt its vengeful spree. Yet, the sword's sinister power of possession looms, threatening both Tia and the enigmatic stranger. Authored by Kohime Ohse, this manga chronicles Tia and Grandeek's ultimate trial against a malevolent force unlike any other.