It’s sort of a fancover? It was released on KSLA, but it was made by TAM, who is a doujin artist. He did some of the music for Rewrite as well I believe.
Not sure if remixes are to be posted here or in their own separate thread, but I guess I’m about to find out…
Little Busters remixes are glorious. Though as far as fan covers, all of TAM’s albums are pretty awesome too.
He did a lot of touhou stuff too, but there are some KEY CDs in there too.