Kaiba Noa was the son of Gosaburo, the wealthy owner of Kaiba Corporation. He was extremely intelligent, and, being a "privileged child," he was able to participate in many activities, including sports. His life was, basically, perfect.
Then, tragedy struck. One day, as he was outside, a car came hurling out of nowhere and hit him. He was immediately sent to the hospital, but despite Gosaburo's constant badgering of the doctors, Noa passed away.