Survivor in Danmachi

(got the cover image off of google, didn't have any credits, if its yours and you want me to remove it tell me and I will.)

After waking up to find himself being bit by a zombie, everything quickly goes downhill for the main character, an average if slightly insane person, he barely manages to kill the zombie, and one other, before succumbing to his injuries, having managed to beat back the influence of the infection through sheer will alone, he now lay dying on the concrete floor, his body broken and damaged as he slowly dies. when his relaxing death is interrupted by an annoying rob, now what?