The sad thing is, Kurumi is a genuinely good kid at heart, but got messed up so bad by her mom and the teacher, who couldn't care less abt her problems and forced her to be their own emotional punching bag cause she didn't have enough authority to go against them. There's just something so frustrating about individuals who are good from the start being constantly abused by the selfish ppl around them and turn into a more f-up version of themselves.
Same goes for Naoi, even if she is far from a saint who did nothing wrong, but just like Kurumi, a combination of terrible parents and teachers is not gonna help the girls deal with their traumas in a healthy way, and even further encourage the girls's own self-destruction tendencies.
Meanwhile, Isanuma and Kokoro, while completely different from each other, are just 2 side of the same line, they both have their own twisted interpretation of Kurumi's "crimes", but due to their own tunnel visions, fail to realize that Kurumi herself, while bear responsibility, isn't really the root cause of the problems.
Personally, to me at least, the "look" Kurumi give Naoi was her finally admit that she knew, and wanted the same thing as Naoi : telling all the ppl who abuse them to go straight to h ell. And since she accepted her own selfish desire, both she and Naoi weren't alone anymore, and isn't that a comforting thought, no matter how short-lived it will be?
And like, idk, even if this is a yuri manga focusing on the romantic (?) relationships of two very broken girls, it still such a good social commentary on how irresponsible adults who are too full of themselves and who are too focused on their own selfish wants can mess up a whole generations of children around them. So much of the problems could be avoided if the adults just stop being abusive, step up to clean their own mess, and interfere when things get out of hands. Kuwabara Tamotsu always have such an interesting view abt society and relationships on their works.
