I can talk about this part now. I found it deeply concerning. It wasn't mentioned or even alluded to at all in any other scenario that the three demons took over クレスメント Summoners.
We know they snatched bodies but not who specifically. Kind of scary レイム was keeping them around this whole time.

I need to know if you laughed as hard at this part as I did.
https://files.catbox.moe/y6qhu0.png
I also need to know which SN1 characters you used for the final battles.