A strange place (chishiy x niragi)

I decide to go and find someone. Someone has to know what's going on.
Everything looks so empty as if the city was an old dollhouse sitting in someone attic.
I go into a store maybe there's a worker there but no sound of people , only a rotten smell.
The smell was familiar, it wasn't a good smell to remember but it's a smell that everybody knows, I look around maybe that smell could lead me to something. I turn the corner just to see that the smell was an expired one, expired food to be exact. Food like this takes days to get this bad. What has happen here ?

-did I fall into a coma and wake up days after everyone was gone?