In the far future, only machines were left in an abandoned city and wondered about the outside of the world.
A leader of the machines decided to form a team of explorers to satisfy the citizens' curiosity.
Therefore, the explorer team adventured into the unknown world beyond their city.
Four explorers found a civilization while wandering and explored around for 10 years but could not find any evidence of life.
They have begun to be disconnected one by one, and now the only explorer, "Pray", remained.
Despite this, Pray continued the exploration in order to complete his given task.

Light and refined FPS
Robots that appear during the expedition attack you from all sides.
Aim at the heads of your enemies, and pull the trigger.
As just like a gun fired by robot, rebound very light and has a good hit rate. Play with a light mind.
always take good care of your ammunition. Know the location of the ammunition around, and be careful not to fall.
Take a good look at the surrounding facilities and landscapes in the robot city. Hints for puzzles are everywhere.