This is a story of swords and sorcery, following the young warrior Tia Allbright and her unlucky assistant, Luke, as they fight demon assassins in a fantasy world. Tia arrives on the island of Marcleida with her trusted sword, 'Grandeek,' which contains a spirit that aids her in her quests. However, she is soon turned away. Determined to enter the island, Tia looks for a way past the fences guarding the entrance, just as another stranger arrives to take on a mysterious job. Someone has been killing the island's inhabitants and possesses the ability to appear and disappear at will. It seems the sword 'Aihorn' has been stolen, and the spirit residing within it seeks vengeance against those who killed its master 50 years ago. As Tia makes her way onto the island, it becomes clear that both she and the stranger are after the sword Aihorn, hoping to put an end to its bloody goal. But the sword has the ability to possess whoever wields it, putting Tia and the stranger at a great disadvantage. Based on the manga by Kohime Ohse, Tia and Grandeek will have to face their most difficult challenge yet...