[Enchilada645]

Ah now this one, this is one of the Makai Senki related ones I recall clearly. Mostly in that this one involves just Rei in the Horror Plot. While we don't get much on him, and mostly the Couple & Horror, we still get a few nice bits from him.

Also it's just a tragic turn of events, a couple grieving for their son and the Horror taking full advantage of that to turn them into monsters. Then at the end, when it's all said and done they're just begging Rei to take their lives, except he can't because no matter the deeds they did they're still human and he has a code to uphold.

I totally get your feelings on wanting a bit more focus on the cast though. I feel like you'll probably get your wish from what I can recall of the season. Though I imagine the way they're utilizing the Horror Plots is partially because we're familiar with the cast and we're more continuing off of character beats we were previously shown than starting entirely fresh.