Shoko is a student at Ryuusei Private Academy Middle School. Her dear sister, Kyoko, had went to study abroad five years ago and hasn't heard from her since. One day, an unknown entity suddenly attacks Shoko. The ones who attacked her had been the Dryads, underlings of the evil goddess, Eris, who was once sealed by Goddess Athena. When Shoko and Saori Kido awaiting the Galaxian Wars meet, the gears of destiny begin to turn.

Shoko cannot hide the shock knowing Kyoko was taken away instead of her as the evil god's host. As Shoko finds out the special position of Athena's handmaidens as well as bodyguards that only women can fill, she decides to become a Saintia herself from her desire to become stronger in order to rescue her sister. Saori requests the Silver Saint, Pavo Mayura, for Shoko's training, however - On the other hand, Milo and Aiolia at the Sanctuary were sensing the evil Goddess Eris' suspicious moves.

Shoko succeeded in entering Eris' temple by chasing Phonos who fled battle. As she searches the temple to save her sister, Kyoko, she is informed of a shocking fact by Ate. When Ate's vines catch Shoko off guard and begin to attack, a golden light enwraps her body. To bring back Shoko, Mii heads to Eris' temple and reunites with her where they find Kyoko's ragged body before their eyes.

Can you defeat your sister who has fused with the evil god? With Mu's question, Shoko agonizes over the fate she bears. That's when Orion Rigel, the Ghost of an ex-Silver Saint, stands before Shoko. From Rigel's sad eyes that once shared a past with Kyoko during Saint years, Shoko senses his true feelings and - Mii vs. Emony, Aiolia vs. Saga, the individual battles within the Temple of Eris begins.

Finally, Shoko faces the evil god Eris. As Saori's Cosmo grows weaker, all of the Saintias-Shoko, Mii, Xiaoling, Katya, and Erda-put their hearts together to challenge Eris. The Gold Saints continue to protect the Sanctuary as they find out Eris' plan of crashing the temple into it. Aiolia and Milo, who face Saga in a deadly battle, plans to destroy the temple, however - A raging destiny encircles the Saintias, Gold Saints, evil god Eris, and Saori Kido. The final battle begins.