The Last watcher is a third-person video game. The story happens after a devastating nuclear war, humans almost disappeared. Most of people stored their awareness in a virtual system in a super spacecraft to the TRAPPIST-1, but still a few people live in the Earth. Survivors built a new civilization on the waste land, they modify their bodies to adapt to the new world. For example, they have a microchip that connects with the visual nerve, the sights will output pleasant colors to the brain, which can make them be peaceful. In this work, you will play a little boy “#931127” to find a truth behind the story through a series of adventures.