Monster Spirit Revival: I Have a Demon-Slaying Blade

This is the apocalypse, an age when monstrous spirits run rampant. Humanity once ruled the globe, but now it can only defend itself in shelters. Firearms are a thing of the past, and cold weapons reign supreme. The male protagonist is an utterly ordinary nobody who unexpectedly awakens the Demon-Slaying Blade. From then on, he sets out to protect humanity’s home and becomes a hero who reaches the pinnacle of martial prowess.