I have tome 1 in Polish. But I can't find more anywhere. Wikipedia says it has 5 volumes (https://en.wikipedia.org/wiki/Johji_Manabe#Works). I have found that there were at least 24 issues released by Dark Horse Comics (https://www.darkhorse.com/Comics/98-025/Drakuun-24The-Hidden-War-Part-6-of-6). At this point I consider this lost media. Shame - I wanted to know more about story, even if it's generic one.
Edit:
Nevermind, I was able to hunt scans in the depths of the Internet somehow. But I guess I can't upload it here - it's owned by Kadokawa.