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Good pacing, clear signs that some thought was put into it: some foreshadowing, but not too much, anticipation build-up (will they go this route or this one?) and then a proper twist. Combine with good animation and this looks like this season's gem to me (not counting some sequels).
Episode 3:
Why Sou's pupils are smaller compared to others?
Episode 13:
I liked previous opening better
Episode 23:
I liked how they played with colors this episode
Episode 24:
Guess last episode will be a prologue then. Or something will be done to resurrect Ushio.