Prologue
Hi, my name is Hikaru, Hikaru Natsu. I wish I could tell you that I'm just another normal kid, going to a normal school. In a sense I am, everyday I go to school normal as can be. I live everyday as normal in my, semi-quite, little city. It's outside the city limits that things get a little weird. You see the world I live in made a great mistake. Well more like a series of mistakes. Outside the city limits is polluted beyond reason. The air in the outside world is so polluted that if you go outside for even a few minutes you will die, the pollution will burn and kill you. The only way the human race has lived is because we built special cities called chrome shelled regios. They are basically giant domes that move on mechanical legs. I'm not really sure how it works but the dome isn't solid, and it's easy to leave it. You wouldn't want to as whatever the dome is and does keeps the inside air clean and breathable. The point of the legs underneath the dome is so that we can move. There is this special substance called Selenium that can only be found in mines. The dome has to be able to move so we can reach different Selenium mines. A city, or chrome shelled regios would die without Selenium. It powers a city's electronic fairy. Electronic fairies are the heart of each city. They are sentient beings that run off of Selenium and control each city's legs and other functions that are too complex for humans to handle. Seems like a cycle right, we need to legs to get Selenium, Selenium to power the electronic fairy, and the electronic fairy to work the legs. Makes sense to get rid of the whole system and save time. There is one other factor though, and it makes the legs seem like more than a necessity. Filth monsters, creatures that where born because of the pollution. They can survive in the outside world unlike us and I'm pretty sure they feed off of the pollution. Thing is they get tired of pollution, and like to feed on other things. The main source of food for filth monsters is human beings. That's why a city has legs, to run away from these things. We don't always escape though, and sometimes the city can't move fast enough. Humans in general developed another way to defend themselves because of that. We discovered kei, an energy source that lives inside each human. Some people's kei is more powerful than others so they learn to use and manipulate it. They channel its through weapons called dite, a small rectangular device that can transform into pretty much any weapon. Using the dite and their kei together these humans, called military artists, kill filth monsters and protect their respective chrome shelled regios. Together they are the one thing stopping filth monsters from killing us all.