Origin of Decay

the beginning of a game
After the explosion of the nuclear power plant, the radiation leaked and turned people into crazy killers.
All reason and intelligence are gone, and only instinct remains to cry. Some of the lunatics began to eat people.
In a ruined city alone, you get a radio from a virus lab that you overheard while living, and you leave the city to get a vaccine.
a brief summary
It's a first-person shooting game that survives in the zombie world.
You must collect items for survival.
Find a way to survive in the destroyed city.