The letter that flashes on-screen for a split second:

To Rin
From : Dad
There was just so little time left after you were born.
I don't know how much love I managed to pour into raising you after your mother died...
But your smile kept me going. (^_^)

I would like to have come with you, but I couldn't.
I wanted you to forget everything and move on... I knew you'd be alright.
But you'll get lonely, and remember.

I know you'll grow strong, and read this letter some day.
I really wish we could have spent more time together. I'm sorry.
You were so young back then, too young to understand what they meant. So let me repeat...

My final words to you.

Transcribed:

凛へ
From : 父
キミが生まれてから、あまりにも時間がなさすぎた。
お母さんがなくなってからキミにどれだけの愛情をそそげただろうか・・・。
父さんは元気なキミをみて勇気づけられたよ(^_^)

本当は一緒に行ければよかったんだけど、それは出来なかった。
全部忘れて進んで欲しいと思ったんだ・・・ キミなら大丈夫だって。
さびしさを知ってしまって、思い出すだろう。

キミが強くなってこの文を呼んでくれると信じて。
もっとたくさんの思い出を作れればよよかったね。 ごめんよ。
小さい時はよくわからなかったと思うけど、今ならきっと。

あの日の言葉をもう一度。