Oz Vessalius is a capable kid who did his best in trying to unravel the mysteries of the world. He can fight but he’s not ready for a battle hardened warrior like Kuroyukihime. She earned her title as one of the kings due to her unbelievable power. She can move faster than Oz would be able to capture with his eyesight and her attacks have a solid amount of piercing power. A single good hit would easily win her the match. Kuroyukihime wins.