I could enjoy this, trashy as it is*, if there weren't the rape backstory. It really doesn't have to go there, as long as you have even the slightest bit of creativity. At this point it just feels pointlessly cruel and makes me lose all my interest because it doesn't seem worth it. Kind of a shame.

*until developments disappoint, which is always a likely possibility with this kind of story

Also, I'd argue drama isn't more realistic than fluff per se. People like to think it is (probably in part because fluff is often extremely optimistic), but really, the world isn't just a pit of infinite darkness. Sometimes good things happen. Sometimes people are happy. You know, fluff.

but the opposite has to be true as well doesn't it. people are happy but that takes REAL work and effort something many fluff relationships do not show (or at least it show well) IMO

Indeed. I'm gonna use your reply to elaborate a bit even though we don't seem to disagree, so please bear with me.

While happiness usually takes effort, sometimes, like in fluff, people are just happy. It happens, even if may be temporary. It's not unrealistic, it just doesn't make for a relatable or interesting story, at least according to Western storytelling traditions. (Maybe this is part of the reason we call it fluff in the first place.)
Warmth and happiness are as realistic as pain and darkness. All of them are part of life. That shallow fluff can ring hollow doesn't mean only depressing stories ever resemble life, which is an attitude many people have (not just cynical teens).

But yeah, I would definitely love a little more fluffy yuri with substance.

I read it a bit differently -- Yomi is a coward for going along with everyone else's wishes instead of standing up for herself.

According to my reading, Mahiru asked her out and Yomi agreed even though her heart wasn't exactly in it, because it's easier. She complied with Mia's blackmail attempt because it's easier (which is not to say it's her own fault, but she herself seemed to think she could have refused had she tried). She moved away because, well, it "solves" all her problems. Breaking up, for example, is not as difficult when you have an excuse, and she won't see her sister again for a while at least.
The point, therefore, is how constantly giving in doesn't make anyone happy in the long run.

Also, I'd argue drama isn't more realistic than fluff per se. People like to think it is (probably in part because fluff is often extremely optimistic), but really, the world isn't just a pit of infinite darkness. Sometimes good things happen. Sometimes people are happy. You know, fluff.