Sho attempts to secretly leave the White Clad to meet Shinra in the Nether. He is observed by Inca, Sumire, and Charon but manages to escape with the help of his guardian Arrow, who remains loyal despite Sho's resistance. Meanwhile, the Special Fire Force Company 8 prepares in Asakusa to resist the Great Cataclysm. Hibana submits her investigation report on the connection between St. Raffles Convent, doppelgängers, and the Great Cataclysm.

Meanwhile, the mole Scop arrives and reveals the final messages of the "Woman in Black": The Great Cataclysm failed 250 years ago due to incomplete pi calculations, which have now been solved through Amaterasu's key. Obi risks meetings with Honda (2nd Company) and Pan (4th Company), who pledge covert support. Under Haumea's leadership, the White Clad initiates the Cataclysm with seismic vibrations, causing worldwide destruction.

The episode ends with the emergence of giant, hostile creatures from the sea – harbingers of the global catastrophe – as the 8th Company prepares to counterattack.