Eden no Ori, Kanojo wo Mamoru 51 no Houhou Recommendations
People are put into a setting where disasters are omnipresent, and the main lead has a leadership quality that brings a group of people together. They also both have a bit of romance
Both manga are about how the main characters survive in natural disasters. The story do not just focus on survival against natural disasters, but also against other people who have adopted a pathological mentality due to constant pressure from the harsh, disastrous conditions.
This is similar because the story of Eden no Ori is a group of people that are trying to fight for their life after a disaster happens.