S3E19: Those Who Fight Back / The Final Imagining

Dr. Giovanni has become an Infernal and taken over Yu's body. He inserts the key into Amaterasu's power generator and triggers the Great Cataclysm. When he does, the world and the images of Adolla begin to merge into one, and large-scale fires break out all over the Empire. As cries of despair rise from the people, the Special Fire Force soldiers are powerless with no course of action left.