I Transmigrated to the Future and Became the Unluckiest Guy Around Beasts

【A bit of an overpowered hero at first, with a happy life; more heartbreak later. You might want to leave your brain at the door.】 A terrible card draw led to transmigration. I thought I had arrived in another world, but it turned out to be Earth, more than five hundred years in the future. Monsters roam everywhere, and fewer than one in ten people have survived. The faithful prayers of the supplicants moved themselves and other people, but never the gods. Humanity's waves of sacrifice failed to reclaim its territory. Instead, they brought even more terrifying creatures into the world. The prosperity of the settlement zones speaks of humanity's former glory. The world beyond the walls tells of the cruelty of the apocalypse. Some live, and some die. In this vast ocean of suffering, I cannot save everyone. If that's the case, then I'll let go of everything I've held onto and declare war on you, the developer!