Dansverdians

Dansverdians is a story about life on Dansverden if humans had not teleported there and colonized it in 3000. Taking place in the year 1711 AKC (which is around 3650 AD,) the Dansverdians, a humanoid species with futuristic technology, live a normal life until the Prototypo II, a spacecraft containing several items from human culture along with what remains of the people who travelled on board over a millennium and a half ago, crashes into the mountains outside of Besech, the largest city on Dansverden. Despite being damaged not only from the crash but also from a close encounter with Dansverden's moon, the Dansverdians recover what remains and believe a Godzilla film (chosen as a reference to the original Year 3000) is a prophecy and that Godzilla is real and destroyed Earth, with the Protoypo II and the people on board being humanity's last hope. The rest of the story is about the Dansverdians preparing for a Godzilla attack, and eventually, they come to the conclusion that Godzilla is fake but not until after they prepare for an attack. During the final chapter, a "monster" does attack, but it is instead a disease with high fatality rate spread via small animals trusted due to their size. Too much interest in defending against Godzilla leads to this disease being ignored, and while it is eventually cured, quite a few victims die off before it is.