basically, the sun apocalypse was happening, it was SO hot outside that people who dared to step outside in the day would burn, not visitors though, they were immune to the heat, you may ask "whats a visitor" a visitor is someone who died, and came back to life cause of this, signs of a visitor is red eyes, perfect teeth and dirty nails, but this isn't about them.

one day, as usual you woke up, with the smell of death filling your lungs, supposed you let in a visitor ey?, blabla, you shot the only person in your house now, it was the cat lady, now your left alone with a CAT GREAT.

you go check up on the cat since well.. It's the only one else in the house with you