The thing that gets me is that Sachi doesn't even seem to care. Like, it doesn't even seem to register that she's hurting Ruki, or that Remi is a toxic pile of garbage who gets off on hurting people and justifies it by saying that everyone else sucks too. She just blithely says that she can't really judge her ex anymore, like she's completely forgotten how fucking awful she felt when she was with him.
Also, fuck Remi, on every level. If she was just a shitty, malicious person who actively enjoys ruining her friends lives and tries to drag everyone else down into the poisonous swamp of apathetic hedonism she lives in, I wouldn't really like her, but I'd be fine with her as a character in a larger cast. The thing that really disgusts me most, is that she's basically the main character. Even if she's not personally, directly involved in every single event, she's the one character with the most agency, the most influence, and acts as the trigger for basically every major point of character development. She hurts whoever she wants to hurt, fucks whoever she wants to fuck, and faces NO CONSEQUENCES. At all! She doesn't make enemies, she doesn't lose friends - christ, people don't even ARGUE with her. She always wins. Everyone is lonely and empty and heartbroken except her, who happily sits in the middle of it all, loving every minute, completely untouched by the slightest trace of trouble or unhappiness.
So fuck Remi. And fuck the author for making a cheap NTR porn fantasy and dressing it up like an angsty emotional drama. God, I'm so fucking butthurt over this, it's not even worth it.