... sometimes, back home ... things would happen, and Roxas and I would fall asleep for a long time. It happened to me first... and when I finally woke up, there were a bunch of sea shells next to my pillow. He'd been putting one there every day. I kept one of them, to remember it by. And later, when it happened to him... I left sea shells by his pillow.

[ she pauses, smiling warmly and a little wistfully at the memory ] So I guess I sort of associate sea shells with friendship... they mean a lot to me. Riku didn't know that, though. I guess he just had a good hunch!