[Avisch]

Ok I got a theory. Sorry if it overlaps with someone else's. Im still reading all the pages of this thread

Spoiler for Ep4 Theory:

One of the survivors of the 1st twilight is the culprit, but only including: Krauss, Kyrie, Kanon, and Shannon.

Why them? They are all present within the "room supposedly in Kuwadorian"

After the the 1st twilight. S/he moves everyone to the room (it takes atleast ten minutes to do this, so s/he uses some sort of device).

S/he wakes up with everyone and pretends to be a victim and as such controls everything to lead to everyone's death.

This doesn't solve Gohda's and Kumasawa's death.