This anime uses a lot symbolism from various things including roses, Biblical stories, Greek mythology, shadow puppetry, and more. There are many interpretations of this symbolism as it relates to the story's main plot. I didn't figure all of it out, but I'd figured out enough to be really entertained by the anime.
This anime discusses what can cause self-actualization and what can prevent self-actualization. For the most part, the anime is focused on self-actualization in teens. Some teens struggle to self-actualize themselves b/c they are attempting to make certain moments eternal. Once you near the end of the anime, you see that everyone in this anime is trying to hold on to something eternal (i.e. precious memories) b/c they are dissatisfied with their personal lives which make up their world. As a result, they try to get "the power to revolutionize world" in order to make whatever they want eternal. Yet, the true power to revolutionize goes beyond holding on to precious moments that you can't experience again. That true power is the freedom to live unhindered by restraints from family, friends, and the world around you through self-actualization.
To review the characters, soundtrack, and animation separately is pointless because they all revolve around the symbolism. They are all engaging, poignant, and complex aspects of the anime. Some of it may be too repetitive, but to me that repetition just serves to drive home the theme of self-actualization.
The only final thoughts I have is that there are some things that may make viewers uncomfortable including implied yuri and yaoi as well as incest. Stay clear of this anime if you don't like this stuff.
Overall, I enjoyed this series A LOT better than I did the first time around. I felt like I was watching a mythological tale play out, and it was very satisfying. If you don't mind analyzing a lot of stuff to understand what's going on, then I recommend this anime. It is a masterpiece.
