The 90s anime style, pacing, music and focus on scenery make it feel like a nostalgic portal to a faraway world lost to you except through glimpses. It's following the magical girl genre but it's much more dark than you'd think of anime from that genre.
The anime is out of order, but it's recommended to watch it this way -- but I could understand that this and the fact that its obscurantist at times isn't for everyone.
