Ep 25. Despair at the Diverging Past and Causality

"Unable to wait for the central vortex to stabilize, Tokiya uses Hagane, Shirogane, Bismuth, and Rhodonite simultaneously to create a gravitational gate. With the second world already vanishing, Yo, Reishiro, Rikka and the others make preparations for their final battle. Amidst the action, still in shock from losing her sister Yukari, Shuri reveals the truth. She is in fact Yukari and has been fighting to save her sister Shuri since she became a burial doll. Upon seeing Yukari's desperation, Tomoharu promises to save her this time."