Souyoku no Busou Tsukai

The world is on the brink of extinction due to an ever-expanding disaster called the "Eternal Storm." However, humanity has a new source of hope in this dying world: weapons which grant power beyond human understanding--the Ability Armaments. Two boys destined to inspire awe with their splendor set out on a journey. Ability Armaments in hand, they won't stop until the world is saved! Source: MANGA UP! Global