Saigo no Yakusoku no Monogatari - Oratorio Messiah

From MangaHelpers: The magic kingdom of Yugudora has thrived on its people that could harness magical spells and was prosperous and peaceful. But with the invasion of the machine kingdom, Savi Shan City, all that is being threatened. Their advances seem impossible and they have finally reached the capital of Yugudora. The guardians of the city, the Messiah Knights, and Wolfe, a newly appointed member, are its last hope. Wolfe and his childhood friend Ceres, a member of the royal family, must put an end to the attacks or watch their country fall. [vyc]