>>532154101
I don't know the of the doujin, it might "COOLRUNNING" though. The artist's name is "Seimu" and this was his website https://web.archive.org/web/19990428190529/http://www3.justnet.ne.jp/%7Eseimu/s.dozin1.html
I've been looking at old fansites recently. I'm searching for early Japanese Sonic material but I mostly find other cool stuff