This is a mini-adventure game that puts you in the role of a lone wanderer. You will start inside a strange compound that you decided to explore and you have no clue about how you got inside and where exactly you are located. The only hint that you have is a letter, but you do not really know what it does mean.
Your only way to find out what happened is to start exploring the environment, the huge compound which will later be proven as the headquarters of an organization called Sigma. You will later have to find out if they were the people who brought you inside.