Full Summary

It all started with a single letter, a letter that was left behind by the woman who never came back.

'I'm not coming back, I found someone who I truly love, and loves me back.

And he was always there when you were not, comforting me when you, Iemitsu, never bothered to visit home.

Goodbye'

For Tsuna, who was only 5 at that time, already understood what the letter had meant, because unknown to everyone, he has always been adept at learning everything.

A/N: if you want to know what happened after Nana left, then by all means, read ;)