The End of the World: the Age of Saprophysis

I lost everything overnight and turned from a human into a saprophytic monster. This kind of monster kills everyone on sight, making me no longer tolerated by other people. But in order to understand her words and save her, I don't have to live. Fortunately, there is a system that changes with me. With the help of it, I slowly develop outside the territory, survive, and slowly accumulate strength. When the time comes, I will figure out why I turned into a saprophytic monster. For now, I just want to survive. After all, this is the greatest capital. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.