is a light novel series written by Minoru Kawakami (川上 稔) and illustrated by Satoyasu (さとやす). It had 14 volumes published from 2003 to 2005 by Dengeki Bunko. It takes place in the past of Horizon in the Middle of Nowhere, another of Kawakami's light novel series. The series takes place in the second era of a six-stage universe, with Kawakami's other works (including Horizon in the Middle of Nowhere) encompassing the other five.
Plot
1945 – The end of World War II. It was a year that would be forever engraved in human history, but it was also the year when another war that does not have a special place in the pages of history ended. Those who knew of it named it the .
Sixty years later, 2005. After the death of his grandfather, the high school student Mikoto Sayama, vice-president of the Taka-Akita Academy's Student Council, is suddenly summoned by the giant corporation IAI. There, he is informed of the existence of the UCAT institution and his grandfather's deep involvement with it and the Concept War. His grandfather and UCAT fought against ten alternate worlds called that existed separate to this one. These worlds were not parallel, they existed in multiple phases atop each other like a planetary orbit. They could approach each other and interact and affect each other on a set cycle, so when this fact was discovered, they began an all out war among themselves to destroy each other. With the world at stake, his grandfather took part on this war in order to destroy other worlds. Therefore, sixty years ago, Sayama's grandfather and his comrades destroyed all the Gears from the 1st to the 10th and at the end only this world, the world known as Low-Gear, survived.
Carrying on his back the phrase "the surname Sayama indicates a villain" and all the hatred, Mikoto Sayama begins the last negotiation with the other Gears survivors, the , in order to save Low-Gear from a new crisis. What is the crisis that approaches Low-Gear, this world in which the survivors of the other worlds live? And what is the meaning of the Leviathan Road which was left to Sayama Mikoto in order to avoid that crisis? Can this world truly reach a conclusion that will not bring its own end despite having ended so many other worlds? When Sayama Mikoto faces the emotions of those who were once defeated, what answer will he give?
Characters
Team Leviathan
The main protagonist. Taka-Akita Academy's Student Council vice-president. Second Year. Team Leviathan representative, negotiator and leader. Always accompanied by Baku. Georgius' user. Currently without any relatives, the Tamiya household take care of him. He was trained by Hiba Ryuutetsu at the Hiba Dojo, so he is quite proficient at martial arts.
By the will of his deceased grandfather Kaoru Sayama, he was designated as the representative of Low-Gear in the negotiations. His grandfather was one of the who destroyed the other worlds. Despite being his grandson, Mikoto's father was adopted so he was not really blood related to his grandfather. As the successor of the villain Kaoru Sayama, he was entrusted with the negotiations that will shape the destiny of the world itself, the Leviathan Road.
He has been raised from childhood to be a superb villain, in other words, to perform necessary evils. However, all his grandfather had taught him was how to do it, not when. As Sayama doesn't know when the abilities he carries are truly necessary, he has grown to never be really serious about anything, at least until he finds about what happened sixty years ago and meets Shinjou, the one who will be his counterbalance.
Sayama has a quite unique and self-centered personality, and even after meeting Shinjou, to whom he shows romantic interest from very early, he does not put the brake to his own eccentricities. As he puts it, "I'm Sayama Mikoto, the negotiator of the Leviathan Road and the person at the center of the world." He likes to wear suits, so when not wearing the school uniform he usually wear a three-piece suit. During fighting, he uses his UCAT anti-Gear combat uniform made up of a white body suit and thick, black tights with white shorts and a coat worn over that. Also he always wears a women's ring on the middle finger of his left hand.