I liked it, despite being a downer. I think Yomi made the right move at the end, since both of her relationships were unhealthy, and hopefully she can make a fresh start in Tokyo. Even if to some degree she's running away with both problems.
I can't honestly say the relationship with either was 'unhealthy' so much as needing something more. And more than just some degree she completely is running away from her problems. She didn't talk to either to explain her decisions, just banged and ditched.
One relationship was incest involving blackmail and the other was using someone for sex, knowing she didn't love them. They were both unhealthy, much as incest is an amusing fantasy in these parts. Yes, she's running away from her problems, she can't avoid her sister forever and she really should have been up-front with her girlfriend. However, with distance there is a lot more options to move forward for both of them at least.
I scond this. I'm just someone who like yuri for the cuteness and eroticness. If we're talking realisticly, incest is not a pretty picture. Realisticly; Yomi at least did something in the end to resolve the bad situation, not the best solution, but I wouldn't expect a person like that to be wise enough to figure that out right away, probabaly best to leave before things get worse. IMO the best thing to do would be, to be honost with her GF and notefy her own parents/school-counselor about the situation so both of the sisters could get some much needed therapy.
This story became a lot more interesting because of the community interpetations, so thanks to all who commented!
Has there ever been a realistic yuri incest manga around these parts that's not filled with sex like this thing (and that's actually good)? It raised interesting concepts, but it was kind of derailed by... all the sex. I have to admit that I have grown to like incest (as long as it's yuri, I give het incest a WIDE berth), but a more realistic one dealing with the actual consequences would be a nice read. Sayuri-san is cute, but it seems that everyone else is pretty much okay with Sayuri's incestuous love. There's just the occasional "B-but we're sisters" kinda thing, but I'm sure she'll change her tune by the end and nobody else will care that she's dating her freaking sister.
It's partly the reason why I like Yuzumori-san. All the yuri loli stuff I've read (again, I stay the hell away from het loli stuff) never really dealt with the consequences and the power imbalance and all that stuff. Hoshizawa Ginza District comes to mind... so yeah, it's funny and fairly unusual to see Mimika freaking out when she realizes she's in love with an elementary schooler, and it'd be a nice change of pace to see something similar for yuri incest... this ended up being much longer than I had originally intended.