Armored Core: Master of Arena

The story of Master of Arena is concurrent between the original Armored Core, a massive battle occurs in Isaac City between two corporations and causes numerous civilian casualties. The Raven from this game is a survivor of this battle, having lost their entire family to the chaos. Swearing revenge, the player enters the Raven's Nest, the central organization of Armored Core pilots, to fight their way to the top and kill Hustler One. (wiki)