Doomsday: I Have a Trading System

In 2100, a mutation occurred on Blue Star. Human beings first rotted and soon turned into cannibalistic monsters! The same goes for animals and plants! One day, a very embarrassed young man walked out of a building and got a trading system as a blessing in disguise. He could trade something from there! People who trade are from all over the world! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.