Manga artist Chimaki Kuori wrote in the afterword of the 15th volume of the manga Saintia Sho that her work is nearing completion.
It's worth remembering that Kuori also mentioned in 2018 that the manga was nearing its end, but has continued publishing it to this day. The author assured readers that this time the story is truly nearing its conclusion.
Synopsis
Saintia Sho tells a parallel story to the classic anime series. In it, we follow the Saintias, a class of maskless warriors who serve directly under the goddess Athena, Saori Kido. The protagonist is Shoko, who becomes a Lesser Horse Saintia to rescue her sister, Kyoko, whose body is possessed by the evil goddess Eris.
The manga launched in Champion RED in 2013.
Source: ANN