Rent Aragami (2003)

The Raging God of Battle was directed by Ryuhei Kitamura (Versus) and tells the tale of a wounded samurai who drags himself and a companion to a remote Buddhist sanctuary. After passing out for several days, he awakes to find his companion dead and is confronted by an immortal demonic creature who lives to find a samurai whose skills can match its own. Only one of them will survive...