A series of time travels triggered by a post-apocalyptic time travel letter, some are funny, some are sad... Different people travel through a series of events in the imaginary world. Their lives are played as a game. Some souls are dead, and some are lucky to survive... In each game, no one is the protagonist. We are just pawns to promote the development of the plot. Even if we are sad, we must live and look for the light that has not yet appeared...