Tadatsugu Sakai is the principal of Musashi Ariadust Academy, and formerly one of the Four Divine Matsudaira Kings. Though somewhat aloof, he still maintains his power.   (source: genesis-horizon.wikia)  

In the far future, humans abandon a devastated Earth and traveled to outer space. However, due to unknown phenomenon that prevents them from traveling into space, humanity returns to Earth only to find it inhospitable except for Japan. 
To accomodate the entire human population, pocket dimensions are created around Japan to house in the populace. In order to find a way to return to outer space, the humans began reenacting human history according to the Holy book Testament. But in the year 1413 of the Testament Era, the nations of the pocket dimensions invade and conquer Japan, dividing the territory into feudal fiefdoms and forcing the original inhabitants of Japan to leave. 
It is now the year 1648 of the Testament Era, the refugees of Japan now live in the city ship Musashi, where it constantly travels around Japan while being watched by the Testament Union, the authority that runs the re-enactment of history. However, rumors of an apocalypse and war begins to spread when the Testament stops revealing what happens next after 1648. 
Taking advantage of this situation, Toori Aoi, head of Musashi Ariadust Academy's Supreme Federation and President of the student council, leads his fellow classmates to use this opportunity to regain their homeland. 
(Source: Wikipedia)

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George Edmond Manley is an American voice artist, adaptation writer, novelist and screenplay writer. He attended San Jose State University, majoring in theatre arts, University of Nevada, Reno, majoring in journalism and holds his associate of science degree in Computer Information Systems from Morrision University and trained at San Francisco's Voice One Studio and with Braintracks Audio's Nancy Wolfson in commercial and character voiceover.    Manley has performed voice work for several ADV Films productions, including Francesco in the second volume of Noir; Impact, the giant robot in Legend of the Mystical Ninja; Hyugi Zeravire from Super Heavyweight God Gravion Zwei; Barba from Hakugei: Legend of The Moby Dick; and the English-language narrator for Kagaku Ninjatai Gatchaman.    Additionally, he has written adaptation scripts for the last six episodes of Gantz, and is the series writer for the newest adaptation of Super Dimension Fortress Macross, 009-1, Coyote Ragtime Show, Pumpkin Scissors and Kadokawa USA's Full Metal Panic! The Second Raid.    Manley was encouraged to become a voice artist after meeting and receiving encouragement at the 2002 FanimeCon from voice artist Amanda Winn-Lee; voice artist Tiffany Grant and her husband ADV Films president Matt Greenfield.    Manley is also an on-air personality for Houston's Taping For The Blind Radio (now known as Turning Sight Into Sound Radio), currently reading the Houston Chronicle and Sports Illustrated on a weekly basis.

The story is set in a distant future where Japan is divided into feudal territories and conquered by other countries. There is a floating city named Musashi that is composed of eight ships in the skies. A war that will determine the fate of the world will be fought by students on the Musashi. 
In the far future, humans abandon the devastated Earth and ascend to the upper world "Tenjo", taking on new, god-like form. But even with their newfound "Godhood", humanity eventually fell into war, resulting in the collapse of Tenjo and the very law of causation, and humanity, having lost their divine powers, returns to the Earth, grown largely uninhabitable, with the exception of a portion of the Far-East (modern-day Japan), which they name "Shinshuu" (Divine States").
As Shinshuu alone is too small to accommodate all of humanity, they duplicate the region in a parallel world they called "Juusou Sekai" (Harmonic Realm"), calling their new territories "Juusou Shinshuu" (Harmonic Divine States). In order to rebuild Tenjo and the law of causation, the returned humans start a reenactment of history, starting from 10,000 BC, following the guidance of historical records from a source known as the "Testament". In the year 1413 TE (Testament Era), the reenactment of the Nanboku-cho War in Shinshuu inadvertently damages the mechanisms separating the worlds, causing Juusou Sekai to collapse into the original world. The humans living in the Juusou Shinshuu thus lost their land, and decide to invade the original world. The people of Shinshuu are defeated, and under the terms of their surrender, their territory is divided by the invaders, and discriminatory laws are imposed on them. Reenactment of history is resumed from 1457AD, but the updates to the Testament unexpectedly end at 1648 AD. A rumor of impending apocalypse begins to spread the world.