The Unknown Journey

In the year 2020, on the Caspian Border (Turkmen-Iranian Border), there is a conflict going on. After those 4 were presumed to be KIA (on the other soldiers' POV), they're in somewhere that they're not used to. 4 soldiers but, 2 different factions with a hatred on each other. Will they work together or finish of the fight with their blood?

Note: I do not own Touken Ranbu, Battlefield 4, Frostbite, EA, DMM, Nitroplus and EXNOA.