Made me uneasy watching it

Although I enjoyed this movie (due to it's ending and how the ending related to the rest of the film.) I felt the love was twisted as well. But how can it not be, the relationship is just wrong, no matter how you look at it from a moral standpoint.

I think if they were a normal brother and sister they would have been at each others' throats. But being at each others' throats would mean unrestrained emotions. Everything about their relationship before the kiss was restrained. Then afterwards, the flood gates seemed to open temporarily. Yori again withdrew his emotions after Tomoko Kusanagi stated the obvious to him about what his relationship would end up doing. The thinking here for Yori seemed like a 'all or nothing at all' way of showing emotion. [Consequently, in the end when he asked Iku to smile through the tears with him, it seemed to me that he had emotionally developed as a person in those last ten steps, enough to be able to make such a request of his decidedly forbidden sister. For me, the fact that they leave hand in hand also speaks leaps and bounds on how far Yori has come emotionally.]

In regarding to the mother, I too was a bit perplexed about what was going through her mind during her 'cleaning scene'. I believe that usually when people are faced with the idea of something 'horrible' happening under their own noise that they will try to come to a conclusion in their mind to deflect those horrible thoughts. She did follow up with asking the the twins about their dating lives in an effort to explain away the unslept in bed in her own mind. (Perhaps trying to justify it as Yori seeing someone secretly from school and sneaking out at night with them.)I may be reading between the lines a lot here, but the out of the blue question seemed to be placed there for a direct fact finding purpose. Moms are sneaky like that. :)

I agree, Yano was completely weird. Tomoko Kusanagi had a direct reason for 'accepting' the twins' relationship, but Yano--- what fool cheers on his friend to do something so completely wrong...with the girl he supposedly likes?! I think it would be taking it too far to say he was a romantic. I think it takes a 'love the girl, love her family' idea to a creepy new level.

About the field. It was just like a big gigantic flashing sign that had been there all along in their minds ["This can't last"], that they could no longer ignore because it was so in their face that it surrounded and engulfed them.

As for me, but were it not for the ending, I would have hated this movie and cursed it for 'wasting my time.' I'm very glad I watched till the end.