In 2045, human resources are exhausted, the atmosphere and driving trajectories have all changed, biological genes and the natural environment have changed, and humans are faced with problems such as indiscriminate virus infection and biological mutation.
Biologically mutated viruses can also infect humans
Faced with this phenomenon, the government has established various departments to deal with the virus
"The Silent One" and "The Cleaner" become the protagonists of the story
Purpose: Protect the environment