This is quite an interesting psychological drama. Many twists and turns, but they are done not just for the shock value, but actually change direction of the story.
One thing I hope for is that not every character ends up having mental problems. I hope that Yuu is in fact a reasonable person and nothing strange is being setup up for her - contrast is good.
I think that once Airi realizes she's been tricked by Hinako and no one cares about what happened anymore she'll use her "clinginess" as means of "revenge" and will cause a lot of mental trauma for her. Re-reversal if you may.