Many years ago, when mineral resources of Earth started to run out, conflicts broke out. Stood in the case, many nations and territories formed an alliance in order to support each other, but many had been dethroned due to poverty and natural disasters. The remaining, also the most powerful empires, are The Kingdom of Amestrid and The Sun Alliance of Nations. They held grudge against each other for many decades and wars have been raging on since then, taking millions of lives. Their hostility peaked up during the historic and legendary carnage of Heaven Falls. Separated after the Heaven Falls bloodbath, 16-year-old soldiers Damien and Elena are desperately want to reunite, but the only way is through battles, and first they have to struggle in the reality at the two sides of the planet. Panic begins to set in after their first day of heading to the warfront...