Holy Grail War No.: 4th Holy Grail War Rider was originally meant to be summoned by Lord Kayneth El-Melloi Archibald, but due to some circumstances, he ended up being Waver Velvet's servant. Iskandar, or how he refers to himself, the King of Conquerors is a noble and courageous man, who prefers to conquer his enemies by winning without killing and controlling without humiliating them. He is known as a marvelous ruler who once almost conquered the whole known world. He is not pragmatic, but is a person who lets history run its course and acts according to his impulses. While he is wild and somewhat inconsiderate to others, his greed ultimately resulted in the happiness of the people he ruled over. In the new era, Rider is mostly amazed by ordinary modern things, and usually spends his free time exploring modern war vehicles and machinery.

A prince of the Emishi tribe, Ashitaka is cursed in combat by a demonic boar. His only hope for a cure is to return to the forested land from which the boar-god originally came and discover what rage infected it. Leaving his people behind forever, he makes that journey and discovers the gods of the forest at war with the humans in a iron-mining town. Ashitaka vows to help the two sides reach a compromise, to cure them of the very anger that now eats away at him. The key to compromise appears to lie with a mysterious human girl who lives amongst the gods.