RWBY: Hyousetsu Teikoku

In the world of Remnant, cities and settlements live under constant threat from the Grimm, creatures drawn to negative emotion. Ruby Rose dreams of becoming a Huntress who protects people from them, and her exceptional skill earns her early admission to Beacon Academy. There she is placed on Team RWBY with her sister Yang, Weiss Schnee, and Blake Belladonna, despite the sharp differences in their personalities and histories.

Just as the four begin to form a real bond, Weiss becomes trapped by a Nightmare, a creature that feeds on buried trauma and imprisons its victim inside a frozen dream world. To save her, Ruby and the others enter that inner world, where Weiss's fears and complicated relationships become physical obstacles they must confront from within.