https://www.reddit.com/r/firebrigade/comments/e952gx/chapter_200_summary/Sumire is revealing herself as a repulsive being with an angel face who caused the fire in the convent and used the sisters as guinea pigs for the doppelgänger experiment.
Hibana is asking furiously Sumire for answers about that experiment.
She tells Karim that Sumire used the Adolla Bugs as bridge building to the real world by putting it in the sisters’ meal for summoning their doppelgängers and replace them in the human combustion process.
Sumire’s smiling and she reveals that they found all the pillars.
Hibana figures out that the only survivors from the fire were only her, Sumire... and Iris.
Sumire reveals that the final pillar is Iris, the first pillar’s doppelgänger but she’s still not aware of.
Then there are some tremors and Sumire is attacking Huo Yan with her elbows releasing an important shockwave and she destroyed Karim’s instrument with her hands.
She says that Rekka was working for her and that she was part of the great cataclysm 200 years ago but it was a failure because of the lack of pillars and energy and so the world partially combusted and she was in charge for creating new pillars since that day.
Hibana is shocked because of Sumire’s origins and realizes that SHC didn’t happen before the great cataclysm so she asks her about the great cataclysm’s nature.
She thinks that if the doppelgängers’ appearance is the result of human combustion by replacing humans then Adolla can replace Earth because of the result of great cataclysm.
Hibana is in full anger and declares she will avenge her friends.
Sumire tells Hibana that they were never dead and summons little black demons from under her feet.
One of them is calling Hibana with suffer and she recognizes Sakura.
Sumire declares that Hell is approaching.