I kinda really want to like this manga but
it doesn't feel right how much it glorifies suicide? It feels like the author just treats it like a "haha they're traumatised for life now, serves them right" which just strikes me as callous and immature revenge porn. Like you could have the character become a shut in or something and it wouldn't have the unfortunate implication of "killing yourself is a good way to take revenge and make people care about you".
There are ways to properly deal with the idea that one has to live with the consequences of their bullying (see koe no katachi), but this really isn't it.