Shirogane no Ishi: Argevollen (ARGEVOLLEN)
The story takes place in a world where two countries, Alandas and Ingermia, have been warring against each other for a very long time. Tokimune, a young man belonging to the eighth independent unit, saves a girl named Jamie when she is attacked by enemy forces. In order to survive, he rides the new weapon Argevollen and fights.
[Source: Anime News Network]