The story of is set in the year 2036, strange phenomena's appear in the sky all over the world all of a sudden and the scientists can not even explain. A mysterious organization called SRO (Science Research Organization) sent several team members to investigate. Protagonist Shelia is tasked by the organization for which she works to prevent SAI, a military organization, from acquiring a legendary ancient power that can reawaken the dead. Behind this incident is the survival of the "two worlds", a dust-laden history will be revealed.