Wings of Deformation: Humanity Counterattacks Zombie Civilization

This era, regardless of whether humans say it is the 20s or so, according to the "insightful people" on the zombie side, it is now the "Ten Years of Red Eyes". The devastated earth is miserable for humans, but the zombies are happy. If you can't get used to it, you will perish! In addition to the people who are kept in captivity for their edible value and whose blood is collected every day without the will to resist, there is also a group of "savages" operating around the world. There is only a theoretical possibility left for humans to return to a dominant position. In fact... Whatever, let's fight it.