Our Last Crusade or the Rise of a New World, Vol. 1 (manga)

"As the unending war between magic and machine rages on, the greatest witch and the strongest swordsman have finally come face to face on the battlefield. They must destroy the other if either of their peoples are to be saved, but this battle may not be so simple. Only one thing is certain: their meeting will change the destiny of this world forever!"--Provided by publisher.