Dear, Kouta.

I hope one day you find this. I just wanted to say I'm sorry. I'm sick and I know that the doctors can't save me. But I'm sorry. So sorry that I'll never see you graduate or walk down the aisle.
I can imagine it though and it's beautiful.
Love you lots little brother - Masako

...

I have my sign.

I love you too, sis.

Goodbye.