How did he get the letter if she only brought it 10000 years later?

Tomzai said:

How did he get the letter if she only brought it 10000 years later?

Time-space shenanigans.

[deleted]

Tomzai said:

How did he get the letter if she only brought it 10000 years later?

You aren't paying attention to the previous pages don't you?

T34/38 said:

You aren't paying attention to the previous pages don't you?

If failing to understand how a letter can somehow warp spacetime and end up in 10000 years in the past, then yes, i didn't pay attention.
It wasn't exactly explained well.

I don't understand it as well, for that matter.
Why did the letter phase out and appear in the past for the boy to find it?

"Love is the one thing we're capable of perceiving that transcends dimensions of time and space"