These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Shocking Swerve: Episode 11, although it's up for debate how much of a swerve it was (seeing how with the Occult in place, you have to have Witches). On the same note, it's up to debate how well it was done.
Tear Jerker: Episode 11, and the Akari arc in episodes 9 and 10. "Thank you, Daddy."
Although it soon turns out she's still alive, everyone's reactions to Maya's "death" in Episode 11 can be pretty bad, especially Fumiaki's.
After you let it sink in, the final episode definitely counts.
Chihiro and her familiar disappearing once Mikaze was defeated since the spell affects all dark magic...good or bad.
No, it's worse than that. Chihiro was of white magic but died of injury before the spell even was cast, note the red spot on her back, and her panther familiar crying for her. Said demonic panther then returned to hell due to the spell and will be alone there, separated from Chihiro, whom he was hinted at to being in love with, while surrounded by the legions of hell who might not be happy at his betrayal.
However When you remember that the timeline was changed in the final episodes. That means none of the above events come to pass. Ultimately saving her.