The game begins with a girl named Kukuru who is a member of the Sacred Clan in Seirya (スメリア, "Sumeria"), a clan that protects the Flame Cion. She is sent by the mayor of her town to extinguish this flame, but once she does, a monster called an Ark Ghoul appears and Kukuru flees. Meanwhile, a boy named Arc prepares to look for his father Yoshua, who has been missing for ten years. He stumbles upon Kukuru and they both defeat the pursuing monsters. Arc makes a promise to Kukuru to re-ignite the flame for her, but he is quickly struck down by the powerful Ark Ghoul. As he lays defeated, Arc hears a voice call out to him. The voice is a Guardian, who revives Arc and tells him to re-ignite the flame. The Guardian also tells Arc that he will return here later to extinguish the flame so that he may retrieve the Ark, a mystical box that will aid him in protecting the world; the Guardian finally adds that Arc's father made an agreement with the Guardians of the planet to protect humanity by the fore-coming darkness. After hearing this, Arc re-ignites the fire and resealing the Ark Ghoul before it could kill Kukuru.