The Dink Network

After taking enough speed and doing an absurd amount of digging, I managed to find out the origin of 9.mid. It's called "Octfalls Excerpt 1" by Hidetoshi Imaizumi. His now defunct page was here. His current site is either here or here but he appears to have deleted all of his music off of his sites at some point which made it incredibly difficult to find. This appears to be his Soundcloud profile and if you go to the "albums" list it shows Octfalls in there but with no tracks added to it.

I also managed to find the finale but so far haven't been able to get the full length original. Also 6.mid/18.mid or "tukiyo" is a misspelling of "tsukiyo" which means "Moonlit Night". Unfortunately I haven't been able to properly source it yet.