Heart Gear manga volume 7 features story and art by Tsuyoshi Takaki.

FINAL VOLUME!

Roue, Chrome, and Rock receive an unexpectedly warm welcome in Heaven Land. When Roue asks if Zett can be revived, D and R agree, but on the condition that she sit down for a one-on-one conversation with each of them first. It's then that Roue learns the truth about the war 200 years ago and of the two plans humans entrusted to D and R in their final days. After tirelessly fighting their way across the wastelands for so long, Roue and Chrome's journey finally comes to an end in this captivating conclusion.