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)

Episode 1 - Open Hostilities / My Other Self

Episode 2 - Resolution / An Ending World

Episode 3 - Sortie / Dignified and Fleeting

Episode 4 - Confrontation / Those Defending Time

Episode 5 - Revelation / Two Histories

Episode 6 - Castaway / The Other World

Episode 7 - Reuniting / A Bitter Dream

Episode 8 - Battlefield / The Price of Bloodshed

Episode 9 - Sudden Turn / Reward for Arrogance

Episode 10 - Counterattack / The Destination of Emotions

Episode 11 - Showdown | At the End of Time

Episode 12 - Encounter / Our Future

A-1 Pictures

Square Enix

Nitroplus

Gunslinger Stratos