Kairi's letter

In the beginning of Kingdom Hearts II, Kairi writes a letter in a bottle and sends it out to sea in the hopes that it will one day reach Sora.

After Sora and Riku defeat Xemnas and are trapped in the Realm of Darkness, Kairi's letter floats up to them and Riku gives it to Sora, knowing that it was for him.

These are the letter's contents:

''Thinking of you, wherever you are. We pray for our sorrows to end, and hope that our hearts will blend, now I will step forward to realize this wish, and who knows? Starting a new journey may not be so hard, or maybe it has already begun. There are many worlds, but they share the same sky- one sky, one destiny.''

Once Sora finishes reading the letter, the Door To Light opens, and Sora and Riku use it to return to Destiny Islands.