Congrats on the anine adaptation!! I'm so excited for it, it looks great from the trailer!!
I think this is one of the first times we're really seeing the effect of the new promise on Shiori, she's mentioned it before but here we're explicitly watching Hinako have fun with other people for once while Shiori has to just watch her and grieve.
Also wow I like the design for the new monster! I wonder if school is suddenly empty since if there's students then there might be an arc of Shiori or even Miko getting publicly revealed as a monster in order to fight it? Maybe the lights out was something of an isolation from the outside world since Hinako mentions it's just the school that blacked out?