This is an amazing read if you're looking for something tragic, there's no happy ending but there's not really any good relationships in it to cheer for either. The brother is truly messed up and by the end you understand they both have problems but her's were really caused by him and manipulation. I don't know if I'd ever re-read this just because of how dark it was but the artwork is beautiful and they do a good job of pulling at your emotions.
It was a pretty good manga, it was short and sweet but it had its moments where it was pretty dramatic
Akuma ga Hallelujah