Arata and the Trinity Seven visit a southern island to investigate some ruins, and in their deepest part, they find a mysterious, amnesic girl. Together with the girl, who calls herself Ceres, embraced by Arin and Hijiri, they enjoy a brief holiday, but, the world suddenly stops, and a legendary devil ‘Giant of the Nornil’ appears.
Currently, the evil goddess Aryan has taken Ceres's as her host body. Ceres's body and soul are now lost, she became the host for the revival of Aryan. Although Aryan feels her emotions towards Arata, which annoys her. As well Aryan revealed that Ceres surname is Celestial, but since Ceres's body is lost, Aryan has taken even her last surname.