The night of erosion (prequel)
Suddenly, at night, forms of life that could never be called human began to appear. It's big enough to be over 2m, and it's disgusting smell and skin that repeats corrosion and regeneration, and even red inside. There were many reasons to be afraid. The monster was originally human, but at night it always turned into its hideous obscurity, and instead of sleeping, it spread fear by walking down the street.
Many speculations have been rampant because the increasing speed is not as fast as expected and the cause of "monsterization" has not yet been identified. The state tried to catch and study monsters to find the cause, and some crazy people worshipped them as God's power.
About three years after that, research was slow and the fear of monsters was diluted a lot, so it was time to think like a past pandemic.
When I suddenly became a monster...