Most of what makes it good is the protagonist, Aileen: she's a natural born leader who is unafraid of doing what she needs to do to get what she wants. She doesn't fill the adorable & nice MC archetype that so many shoujo have, instead really acting like a villainess when she needs to do so. It's refreshing to see a character who does things out of her own volition and has a strong sense of justice. It's not about simply screaming to "stop" and acting cute so people get attached to her, but making plans so things will go the way you want and you'll be able to save the people you want to save.
Because of Aileen and some surprising/mildly dark moments, this could have been way better if not for some rushed parts (mostly the romance. Even though it was nice, it settled way too fast and whenever there was a problem between them those would also be resolved wayyy too quickly) and the overall cute-sy art. If some parts were taken in a more serious note, this could've been way better. The lighthearted moments are good and they make Akuyaku Reijou what it is, but some dark and scary moments would've been good too. All tense moments are so cute you can never get worried and so their potential and seriousness get destroyed. The ending song/visuals were great and kind of had the tone I wish the anime had.
The antagonist is interesting as well and we have some cool side characters that were sadly not developed enough... But as I said, it's an overall positive experience. Some arcs are better than the others (my favorite was the second one) but each of them has a nice moment or two that makes it worth watching.
An anime for those who like Isekai villainess who act more like villainess and for those who just want to watch more shoujo romance. A little more than an anime to pass the time, but not much. I don't regret watching it though.
