Manga DARLING in the FRANXX

The course of human development was completely changed when they learned to create fuel from magma, as a result of which the entire surface of the earth was disfigured by excavations. After a while, special plantations without plants appear on the earth. However, terrifying monsters begin to torment the Earth, because of which a huge number of people die. As a result, humanity decides to create a special type of weapon that destroys them. The main feature of this weapon is that it must be controlled by paired pilots who need to be trained long enough so that they can perfectly cope with control. Hiro is the protagonist of the story, and he is one of these warriors who were raised in a special garden. All his life he was taught that if he could not kill monsters, then he was useless. The guy's life will collapse when it turns out that he and his partner have never been able to achieve compatibility. He was about to die when he suddenly met a mysterious girl who wants to become his partner!