The Time Administration is an autonomous and mysterious government agency that reports directly to the highest government official. Only the king, the prime minister, and a very few people know about it. To travel to other times, one needs to pass through a gate guarded by a government patrol. Its purpose is to check and prevent any intrusion into the past that affects our current lives or vice versa, which is mostly to use history for their own selfish desires. To do this, the patrol needs to go to the past and prevent them from happening.