Infinity Fortress

Mugenjou is an imaginary place in the backstreets of Ura Shinjuku in the manga Getbackers. In Japanese, the term translates as the Infinite Fortress. In English dubbing of the anime, Mugenjou is also named Limitless Fortress, Maze City and Infinity Fortress.

Citizens of the Mugenjou
The people who resides in Mugenjou come from various backgrounds and are all, amazingly, very strong. Essentially, MakubeX says that Mugenjou is divided into three main strata: the Lower City, the Beltline and the Babylon City.

The Lower City
The most usual facade of the Mugenjou comprises several thousands (in some instances, Sakura said even millions) of subjects under the rule of MakubeX and his minions. Before MakubeX, the supreme rulers of the Lower City were Fuuga (under Fuuchouin Kazuki) and VOLTS (under Raitei-Ginji, of whom MakubeX himself was one of the Four Kings). The Lower City faces perpetual threat of attacks from the Beltline, and most of the time MakubeX spends his time constructing 'Logic Walls' around the boundaries between the two strata to protect the Lower City.