Fate/Grand Order: Himuro no Tenchi - 7-nin no Saikyou Gijin-hen

Fate/Grand Order氷室の天地～7人の最強偉人篇～

The source material follows three girls — Kaede Makidera, Kane Himuro, and Yukika Saegusa — at Homurahara Academy, but has nothing to do with the efforts to restore the Human Order.

(Source: Anime News Network, edited)