A mysterious figure known only as Phantom, claiming to be an agent of the group Golden Bat, kidnaps the Western Bloc scientist Dr. Satonaka. He invites three agents from the West, Mylene, Mars and Opollo, and three from the East, Loki, Freya, and Odin to his haunted castle for a treasure hunt, with Dr. Satonaka's research AI data as the prize. Freya starts searching before the arranged start time and winds up dead as does Opollo. Meanwhile, the Phantom captures Odin and Mars and prepares to guillotine them and reveals that he is Satonaka himself, He is seeking revenge for a failed kidnap event three years earlier in which his research staff and wife Maria were needlessly killed in the crossfire between the West and East forces. He executes the two agents and then causes an explosion, destroying the castle. In the aftermath, the surviving agents introduce themselves as "Muse" and "Loki", neither of which are their real names.