i think the main reason I've consistently ranked Happy Sugar Life in such a high tier has to do with the fact that I'm actually NOT a fan of the traditional one-sided yandere trope (as in where only one of them is a crazy yandere rather than both of them being mutually crazy, like Noir) and don't care for how it's normally used as a way to write women as being obsessed with a man etc. etc. so the way HSL critiqued the concept really worked for me. The idea of taking the concept to the logical extreme of "y'know, someone being like that irl would actually be pretty fucked up" by having the guts to connect it to concepts as disturbing as child abduction, grooming, and pedophilia without being edgy for edgy's sake was an inspired choice imo. It uses the trope to tell a somber story about generational trauma and the cycle of abuse and how without support from people who care about them it's tragically common for those who are abused and isolated to end up continuing that cycle because that's all they were taught. As someone who suffered as the subject of abuse from a generational pattern and who has worked hard to break that cycle, Satou's story and ultimate participation in the cycle is DEVASTATING. I don't like to use the word "deconstruction" because it gets thrown around so casually but I love HSl for being an EXAMINATION of the trope and its impact. Idk it's just really good I think
this is also why i can't STAND the weird sanitization some fans insist on by claiming that the love Satou felt for Shio was "sisterly" or "motherly" because that robs the series of so much of its bite and comes across as being unwilling to actually examine the text for the sake of trying to excuse a character's actions by...making her less interesting? i get that it's a hard topic to acknowledge and discuss but if it bothers you that much then why not go back to one of the million other examples of yanderes who are portrayed in a much more positive light and who don't do terrible things on the same level she did? there's literally no point to it. also if someone is doing it because they're a satoshio fan then that's just cowardly and if someone is into satoshio i think that means at least having the chutzpah to acknowledge it for what it is if you're gonna ship it. like i'm not even trying to attack people for shipping it or whatever i'm just saying grow some fucking balls
The reason the "sisterly or motherly love for Shio" takes exist despite such terms not being very accurate descriptors for what Satou canonically felt for Shio is not always just to sanitize the creepy, child grooming lolicon relationship or to make excuses for Satou, but because the canon narrative itself stressed towards the end that Satou's feelings for Shio, at their innermost core, were not romantic. As Satou and Shio are falling off the burning building, Satou's mind goes to prettified fantasies of romantic love, complete with her and Shio literally getting married at the alter, only for this to give way to an epiphany that "Wait, this isn't right! The love I feel for Shio is a much different, much deeper form of love that goes beyond these dreamy desires!", and this dawns on Satou because for the first time, as the reality of impending death sinks in, this deeply affectionate and protective love is stripped of all selfishness and she finally puts Shio first ahead of herself entirely for Shio's own sake, sacrificing her own life so that Shio can keep her's. Satou may have gone all that time believing that she was romantically attracted to Shio and even that she had to be romantically attracted to her because the one person in the world for whom her heart feels a love deeper than anyone and anything else has to be her soulmate, age be damned, but in her final moment it became clear it was all a delusion.
Two things are true at once: that Satou loved Shio on a personal level in general rather than truly loving her romantically or sexually, and that Satou was sincerely set on her and Shio being romantic lovers to the point where she was repressing her, abusing her and grooming her up for when she'd come of age and be able to be that lover who could engage in romantic and sexual activity with her. That's a huge part of the "bittersweetness" that defined Satou and her "love", and what made her such a foul, filthy, damaged and disturbed soul who we love, loathe, respect and fear all at once.