Saint Seiya: Saintia Sho

The protagonist, Shoko, is a middle school student who goes to Ryusei Academy. Her older sister, who she was very close to, had gone to study overseas 5 years ago and hadn't been heard from since. One day, something unknown attacks Shoko. The thing that attacked her was a Dryad, a servant of the evil goddess Eris, who had been sealed away by the goddess Athena. It was then that Shoko learns...