All the "free manga" I'm talking about are Japanese edition, so just for your information...
The Isolated Zone vol.7 Japanese edition has been released via KDP. So I put some other titles on Free Campaign. The Isolated Zone vol.1 vol.2 and vol.6.
In English version is available till vol.2, at eManga.com. Because it's(Japanese edition) is free, why don't you get both version and compare them? (the quality, such as resolutions, Japanese version is better I think)
The latest volume is "7"
And Moon and Blood 1 &2 are free as well. (The link goes to Amazon.com)