Saint Seiya: Saintia Sho

Saint Seiya: Saintia Shō is an spin-off manga and anime of Saint Seiya. An original net animation by Gonzo premiered on December 10, 2018.

Plot
Shoko and Kyoko are two sisters that were separated by the Mitsumasa's Kido Foundation, 10 years later, Shoko decides to find her sister and goes to talk with the new boss of the Kido Foundation Saori Kido, and discover that her sister Kyoko now is a Saint who protect Athena and Saori Kido is Athena, but the meeting is interrupted by the goddess Eris who wants to conquer the world and to do that she must destroy Athena, but Eris doesn't have a body so she finds Shoko as a good vessel, Kyoko sacrifice herself in order to protect her sister and is possessed by Eris, now Shoko in order to rescue her sister must become a Saint.