Just hope it won't try and depict Yuhi as innocent Victim, considering the shamelessness we've been shown
While Yuhi's heartbreak is likely how she got started on her current path, I don't think the story is going to ignore that her choices since then have all been on her. Sakurako's internal narrations have included calling Yuhi out on her shamelessness, noticing that Yuhi lies to her when it's convenient, and also how manipulative Yuhi can be when she wants something or tries to smooth over someone calling her out on her behavior.
The current situation is all of Yuhi's making. Yuhi wants convenient friends with benefits for attention, affection, and sex. She'll humor what she observes to be their desires, but she really only cares about herself. This is what is causing Chiwa's meltdown. Now that it's becoming clearer to her that Yuhi doesn't really care about her outside of empty words when they're together, she wants payback for being neglected.
I consider the irony of the situation that Sakurako will have her "revenge" in a way. By just coming back into Yuhi's life, she was able to make enough of an impact on Yuhi to grab her attention, so that Yuhi starts treating her friends with benefits worse, resulting in her carefree lifestyle being brought to a forcible close. I also don't see Sakurako immediately agreeing to accept Yuhi when this happens. It'll likely be a rejection for some time due to Yuhi's current behavior leading to Sakurako being unable to trust her.