Imma try to explain what I think is going on since some people are confused

Charlotte wants to take Evan (her fifth disciple) back to the other country (out of Marveil at least) bc Marveil is a country for magicians with a lotta mana or something. Evan must have formed a contract with that demon Calamity guy or something and would be less powerful in that other country with low mana.
While they are making their escape, suddenly some dark people (demons) are attacking and Charlotte decides to go help the people.
The red-haired siblings are kinda on their way into the city and end up helping too.
The butterflies we see are related to the pink-haired fairy who is as we learned the fourth disiciple (all her disciples are: blackie with red eyes, Yurian, the emperor guy, the fairy and Evan — when the fairy showed up Yurian said they’re all together again bc they’re all in the city I think and usually they go about their own business).
So on the last pages we see Charlotte following the butterflies and finds that demon thing. She knows the fairy is there too and kinda talks about how she wasn’t showing herself (the fairy I mean) and Charlotte just goes to stand directly in harms way to lure her out. That musta kinda pissed off the fairy (or she’s been pissed bc Charlotte tried killing herself) so she just went and swallowed up Charlotte, sending her to a subspace. Charlotte trusts the fairy and goes to sleep (kinda).
And then in the last panel we see Charlotte being woken up by the siblings and she’s in a wedding gown or something ??? I think it’s just a vision or an illusion or maybe even a memory?

The only question still in the room is the siblings' suspicious behavior, especially the girl. Idk if the fairy used her body for a while or if they have real special abilities but I guess/hope we’ll find out in the next chapters ╮(￣▽￣)╭