Well, if this turns out so toxic it becomes wholesome and healing in some twisted kind of way, giving us a happy end, i'm all for it. But if the girls start puking at each other and one strangling the other, then carrying her through some snowstorm, just to collapse and to die next to her "lovers" corpse, then i'm not all that much for it.
I mean, I doubt this ends well. They relate with each other due to their similar life experiences but not in a healthy way. With the theme of the series being toxic forms of affection or love, I doubt their own relationship goes unexamined.
How bad it goes is another question and there is probably not any point in trying to top that particular series (plus they actually both like each other in this one), but I would expect something closer to that than any variant "wholesome and healing."
Though if they can pull off an even remotely happy ending I will be okay with it, but I expect it's going to get worse before it even possibly gets better.
Edit:
I don't even feel bad for Kokoro. Your friend clearly has an abusive mother--physically and emotionally. Either she didn't know that--in which case she's a shitty and unobservant friend, or she did know and she did something to threaten her friends safety. I hope she gets her heart stamped into little pieces.
Choking seggs with knives when?
Also re:Kokoro, I will reference my earlier post.
A lot of the misunderstanding really stems a lot from Kurumi not communicating to Kokoro that there was more to the situation or considering why Kokoro might be uncomfortable being put in the position of "the only person who knows." Kokoro wanting to involve an authority figure is relatively reasonable and "I don't want to worry my parents" could be a statement made by someone downplaying the impact on themselves, rather than someone who doesn't have the type of relationship with their parents where they can talk about stuff. Kokoro presumably does have that type of trusting relationship with her parents.
This kind of gap in understanding is actually pretty realistic I think, where often well intentioned people make things worse for kids in abusive or difficult home environments and do so in a way where the person in the bad situation ends up blaming themselves. Probably the situation will deteriorate a lot more as Kurumi goes past the point of what Kokoro can accept or forgive.
Or in other words, I think this is exactly the kind of thing a reasonably well intentioned kid with limited life experience could miss, especially when Kurumi is doing her best to stop other people from realizing there's anything weird going on at home.
I do think this is trending toward evil Kokoro now though because Kokoro really likes being the person Kurumi can most trust and relax around. IRL, she could just accept this new side of Kurumi and continue trying to be her friend (giving up on romance if Kurumi doesn't reciprocate) to be a good influence on her or else just quietly distancing herself from her. However, drama and the story themes dictate that she responds badly to this loss of control and influence over the person towards whom she has affection.