Excellent, really great. This story is literally about vampire roaming around the post-post apocalyptic fantasy world, where Earth and another world merges together. The story is well crafted, with most of the world-building being well thought out.

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Rather revolutionary on its own. Instead of regular humans summoning weapons, this demonic army found a cursed modern weapon and uses it to its own ends. A satisfying read, to be honest, looking for more.

A very good story, overall. The author manages to convey the character's opinion in each location in new vegas and having a somehow relevant opinion with what I had in mind. 10/10.