On her snowboard, Ruby slides down the snowy field. Weiss, possessed by the Grimm “Nightmare”, created a world in her dreams, which is a reflection of her mind. With the help of Shion, a Huntsman specializing in the Grimm “Nightmare”, Ruby sneaks into Weiss’ dream and heads toward the place where the “Nightmare” had taken root. Those possessed by the “Nightmare” will be entrapped in a nightmare where Aura and life will be deprived. Weiss was already in a dangerous condition. Ruby was so eager to quickly free Weiss from the “Nightmare” but the world reflecting Weiss’ mind, block’s Ruby’s way.

With advice from Team JNPR, Penny, and Sun, Ruby’s party decides to try a new plan. Along with Jaune, who had acquired immunity toward the “Nightmare”, the four sneak into Weiss’ dream. Using the train they had rescued from White Fang, they were able to approach close to the center of the empire. Jaune, not being affected by the “Nightmare”, was able to move freely, releases the Sillies, the residents of the dream who were locked away by the empire, and succeeds in obtaining a new relic. Suddenly, a large number of little Weiss jumps out…

The city falls along with the deformed Sillies and the robot soldiers affected by the bugs’ rampage. As the situation gets chaotic, Nega-Weiss shows up with a giant statute of Nicholas, capturing the Sillies one after another. Although Jaune bravely confronts the statue of Jacques, who is wearing armor that’s reminiscent of Grimm “Geist”, he and Pyrrha, a resident of the dream, are captured. Meanwhile, Ruby’s party manages to reach the core of the dream where the “Nightmare” had rooted, but Nega-Weiss stands in their way. Yang and Blake are swallowed into the glyphs and disappear.

As Yang fights the statue of Nicholas, Jaune and the Sillies fight the statue of Jacques. The robot army that had been created from Weiss’s nightmare fight the deformed White Fang which had been created from Blake’s nightmare. While battles are held in various places, Nega-Weiss clashes with Nega-Blake. Weiss is overwhelmed but tries to confront Nega-Blake, raging with Faunus’ anger who were being continuously oppressed. On the other hand, Ruby reaches the core of the dream and attacks the briar that covers the “Nightmare” but it quickly goes back to its original form and she is unable to destroy it. As she gets flustered, she remembers the words Weiss had said in Ruby’s dreams.