Kasane is a manga which ends up defying expectations (I know, I know). The premise is obviously a stereotypical kid gains superpowers gimmick, but don't let that decide the value of this manga. Give her a few chapters to get into her groove, she's a child, she's learning.
Kasane is not a happy-go-lucky story. It tackles difficult subjects such as ugliness, privilege, differing worldviews, and the unfairness of life in general. The story can linger too long in some arcs, and rush through, but overall forms a dark cohesive web that will ensnare you, if you let it.
Kasane's style is very much focused on the characters. We won't see sweeping battlelines and epic battles here. What we do have are very personal details. Expressive hands, eyes, and body language. One minor criticism I have is that the female characters blend occasionally blend together.
This manga's jewels are its characters. They throw themselves into the world around them, and are buffeted mercilessly by reality. They have goals that evolve and change, and they respond to them, sometimes better than others. And morality be damned.
It's been sometime since I had a character not aligned with the light, yet not covered in edge. Are some characters evil for the sake of being evil? Perhaps. But that's just how it is isn't it? I could only sit back and enjoy the twisted yet beautiful world.
I applaud the author for working to bring this story to light and letting it grow over so many volumes. It's not a story for everyone. But if you're looking for a twisted guilty pleasure, let the story steal your face for a few hours.