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It is the Chinese belief that, if you burn something, it will reach the departed person you intended it for.
Minato-sensei,
You probably think I'm crazy by now, sending this letter. Come to think about it, I'm not so sure about my sanity myself. You're dead. Gone. And here I sit, wishing that I were saying this to your face, and not on some shitty piece of paper to burn.
I attended the funeral, 'attended' being used loosely. It would be more accurate to say that I was dragged there by Jiraiya-sama himself. He isn't much better than I am. Then again, no one is. I've never seen the Sandaime cry before.
Rin's dead. The fox got to her before you could take it away. She died in the line of duty with a smile, thinking that you would fix everything.
You broke your promise, Sensei. You'd promised you'd not die so soon, that you wouldn't leave us- me all alone. Yet now you're dead, and all I've got left of you is that face on the mountain watching me and this damn kunai. They're just not enough.
Kakashi