A.D. 2115—the island nation once called Japan is now known as the “17th Far East Imperial City Management District.” 
 
The citizens were promised a life of peace in exchange for some of the comfort they were used to having. People believed their lives would never change and tomorrow will be the same as today. No one suspected the impending doom which their society was about to face. 
 
“Degradation”—a rare disease which led to the total disintegration of the human body to a mere pile of sand was slowly but surely spreading throughout the world. 
 
Tohru Kazasumi, an ordinary student becomes embroiled in a multi universal battle between his world and the parallel world of “Frontier S (Stratos).” This meant that Tohru must fight himself from an alternate world. 
 
Their futures collide as their paths cross. Will both worlds ever find peace? 
 
(Source: Crunchyroll)

In 2115, the country known formerly as Japan has been split into two parallel worlds: the Frontier S (Stratos) and the 17th Far East Imperial City Management District. Frontier S is an outlaw universe in which freedom runs rampant, while the 17th Far East Imperial City Management District is a totalitarian universe completely bereft of freedom and is under constant surveillance. When the two universes are starting to fuse into one, the government of each worlds initiates the Operation Stratos, a world-scale protocol wherein a handpicked group of gunslingers, mercenaries, and special individuals, each from the two universes, will be sent in the year 2015 to alter the past by eliminating the other side until only one group survives, erasing a parallel universe in the process. 
 
(Source: Wikipedia)

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