Legend has it that there are countless parallel spaces throughout the universe. These parallel spaces are reflected in the real space of our lives through novels or movies. There are very powerful barriers between spaces. Only those with special powers can pass through the barriers and continuously wander through the space. These parallel spaces are maintained through the plots of some main characters. If there is an incident where the main plot is artificially reversed or the development of the plot is blocked, it will become another parallel space. Then the person who caused this incident will be hunted down by the guardians of the Space Administration. Those who have no purpose are called time travelers, and those who destroy with purpose are called space destroyers by the guardians.