Foreshadowing in Sputnik Sweetheart

"'If I had my way, me too,' Sumire said, beaming. 'But what can you do? Wonderful things always come to an end'" (110).

When Miu told about her and Sumire's conversation, this line seemed to pop out at me as a kind of foreshadowing. For me, it seemed to foretell of Sumire's disappearance. The two had been speaking of how long they wish they could have stayed at the cottage. Although we see this excerpt in hindsight already knowing what had happened, it seems as though it had a purpose. I find it more than a coincidence that the line would be placed in one of the last conversations the two would have together.

We don't know exactly why Sumire left. Most would probably believe her disappearance had to with her advances being rejected by Miu. She was ashamed. However, because of this foreshadow, one could argue that maybe Sumire got bored with Miu. Maybe if she couldn't have a sexual relationship with Miu then she would not have one with her at all.