Haibane Renmei manga

I absolutely love this series. My favorite thing to ever grace a screen and touched me in a way no series has done before. This coming from someone who isn't spiritual or religious in any sense.

Problem is I want to expand on it, but I cannot seem to find the original manga starting with "Vol 1: Haibane of Old Home" or 1998 Dojinshi ANYWHERE.

I have tried to legitimately look it up and buy it, but I can only find "Haibane Renmei volume 1" which is the straight manga version of the anime with color screen caps from the anime which and not the original with black and white drawings.

I've also tried looking through other sources because of my desperation like torrents but cannot find it ANYWHERE. I so badly want to read it.

Any help would be very, VERY much appreciated.