Eien No Hizashi No Shikabane summary:

After six months since the appearance of zombies in this world, Mikura, who was surviving alone in the post-apocalyptic world, encountered a young girl called Yuyu in a house he had broken into. When he tried to escape without caring, her zombified mother attacked him, barely managing to escape this crisis. Mikura felt responsible about the girl who should have been eaten by her mother. Going back home for revenge, an unexpected sight met Mikura's eyes — Yuyu was miraculously alive. Despite being on the verge of attacking her daughter, the mother zombie desperately tried to commit suicide. "Could this zombie still retain its reason...!?" Mikura was astonished at the incomprehensible scene, but because the zombie couldn't even die, he decided to escape with Yuyu. The last expression Mikura saw on the face of the mother zombie was that of a kind mother...