If you're looking for manga similar to Gekidol, you might like these titles.
Earth after World War II. Rebuilding after the destruction has given rise to various vices. Disposers roam the cities cloaked in shadow and mystery. Kaede is a Disposer of SA rank, the highest level a disposer can reach. But he has to be in Central City, he must find the one who murdered his father...at any cost.
Beware and hunt all of what's out there because you'll never know when --- you're the hunted.
A young man wakes up to devastation that could only have been caused by WWIII. Knowing he might be the last man alive, he sets off to see if he can rebuild the world.
It's the year XXXX, and the world has come to an end. In this post-apocalyptic world overseen by "God", people live as if they're creatures that creep along the ground. Mankind has been nearly depleted, and Kasago is one the few people left. Kasago blindly believes in "God" and, following the commandment he was given, begins working as a "Civilization Collector" in which he steals away any scrap of culture from people. While on the job, Kasago meets Mebaru, who makes no attempt to hide her doubts and suspicion about "God". Kasago is searching for his parents, while Mebaru is searching for her parent's enemies. Thus, these two total opposites continue on their journey, coming into contact with "civilization" and collecting it...
Several hundred years ago, a meteor struck the Earth and wiped out most of the planet's livable land, along with the majority of the human race. What was left of mankind had to build new residences further and further up to house everyone on the little land that remained. Those on the ground - the bottom-most level in the new global caste system - cannot even dream of having a "normal" life. Despite this, Nichika and her older sister strive to keep on living each day, but Nichika has a secret that even she herself doesn't know about...?!