I love the spider one. The misdirect in the anime was well done. It gave enough hints without spelling it out.
Mercuri
Feels like a whole lot of nothing happens this episode. Although I wasn't expecting a Chunibyo with a Chaingun.
Alma recovered his memories after the fight with Amaryllis which causes him to have an mental health crisis so he abandons Hikaru. And by the way, Alma has magically acquired the ability to operate on his own now by getting his memories back.
We get a little backstory that shows Alma and Fist with the Kagami brothers. They try to wake up Ordela only for things to go horribly wrong as it starts attacking everyone. Real Master Hand from Smash Bros vibes.
In the process of shutting down Ordela's rampage, Yakumo dies. Alma gets PTSD and goes dormant.
Back in the present, Alma gets noogies from Jun. It's really important for the plot. Trust.
Hikaru gets a pep-talk from Aki and decides he's going to help Alma. Episode ends with the big bad trying to open Ordela again.
I gave it 3 episodes but it just didn't do it for me. I liked the first episode but after that it got boring for me real fast. Buuuut I like that it exists, if only because it's cool to isekai everything.