Hibana confronts Sister Sumire, who as the Seventh Pillar of the White Clad experimented in the destroyed St. Raffles Convent to create doppelgangers from Adolla. Sumire reveals that she manipulated "human pillars" for the next Great Cataclysm over 250 years. Through Adolla insects in food, she deliberately triggered spontaneous combustions to force the fusion of doppelgangers with humans. Hibana realizes that the Great Cataclysm was a failed attempt to unite the worlds – a plan the White Clad now seeks to complete with all Adolla Burst bearers.

In parallel, Arthur begins an absurdly comical search for the legendary metal Orichalcum, orchestrated by Vulcan, to strengthen Arthur's knightly imagination and combat power. With the help of fake clues and "allies" like Lisa and Yu, he scours Asakusa while Vulcan secretly prepares a decoy. Despite logical fallacies (e.g., searching in the Nether), Arthur remains convinced he will restore his "holy blade."

The episode ends with a cliffhanger: Sumire, reaffirming her role as the "Mother of Darkness," activates seismic vibrations to bury Hibana and her group. Meanwhile, Arthur's mother unexpectedly arrives in Asakusa – a hint at unresolved secrets from his past. In the background, Benimaru and Joker plan their resistance against the White Clad, while the 8th Company prepares for the final conflict.