Hi, I've seen Saikano until chapted 9
(I'm downloading the rest right now)
And, as you all, I think the anime is great.

Okay, I just want to ask about that song...
don't know the name, but is the only one
made only of electric guitar.
(you should know which one I'm refering to)

So I was wondering of this song is included
in the OST or not, because I found a page
with just some songs from the OST and I'm
desesperately looking for that song.
(You know, can't get it out of my head)

Thanks in advance for any info.

I think you are refering to
Hoshi no Hate

Well, I think it could be Kanashami no Nukumori, as well as Hoshi no Hate.
Either way, both of them are included in the OST.
Hope I helped you.

Thanks guys, found it.