Junk Force. Vol. 1 - Hideki Kakinuma

It's 2100 and the earth is an ecological wasteland: the people of the Earth put their trust in the reckless organisation known as Z.P.T. which promised to purify the Earth and turn it back into a living planet once again. The plan fails tragically, ending in a massacre of many of the Earth's inhabitants. Was it their plan all along? In this post-apocalyptic world, Liza, Wooty, Mill and the luckiest man alive, Louis, use their mechanical prowess to fend off waves of Z.P.T.'s superior mechanical forces with their salvaged monster tanks and junked together weapons.