The Uninvited Priestess

Why was she chosen to be a priestess? "The crystal indicated it. 'The time has come.'" Once every 100 years, four priestess candidates are gathered in the divine kingdom of Ariarante, where they are given divine powers. However, Kuruku - a poor, abandoned girl, is chosen as the non-existent "fifth" candidate. Finally, the ceremony to decide the four priestesses is held, but the chosen priestesses mysteriously disappear from the temple one after another. However, the priests act as if nothing has changed—what is the truth of this place? As Kuruku approaches the heart of Arialante, another conspiracy awakens before her.