Nagagutsu wo Haita Neko

'The Cat Returns' is basically a remake, the plot is very similar, as they are both about a human character who becomes royalty while an elegant swordsman who happens to be a cat who stands on two legs helps them througout the story, and the climax is basically the exact same: a race to the top of a giant tower against the main villain so that the main character can defeat the villain. The villain in both movies also happen to use a magical artifact which gives them all their power; when the artifact is destroyed, the villain becomes powerless.