Tales of Demons and Gods: The Blood Emperor

Shin Akagawa, heir of the Akagawa clan suddenly had to take things into his hands as his parents died and left him alone to govern one of the last cities of Humanity, fortunately he seems to have a chance at survival in this city called Glory City but how will he do it exactly? TDG fanfic with Oc protagonist who is not a reincarnated and has no knowledge of the plot.