The Last Epidemic

Here is a story that defines both dark and survival in one context. A story that signifies emotional life into one tremor. This is a story of a boy, named "Ryan", in his late teen, that learns how the truth can wither away humanity, and ruin the society that he lives in.

One morning! Ryan wakes up to find no one in his home. He desperately gains suspicious and starts shouting. Hearing a growl from the outside he goes and takes a look.
What he sees is unbelievable. He hesitates and slowly backs away. A Silhouette figure, showing a dark presence. Looking abnormal and not human-like it starts to crawl to Ryan's house.

What is coming to his home? And What has Ryan slept through...?