Now I know that I probably shouldn't start a new story right now as I still have my Harry Potter/Pokémon crossover but this story idea has been stuck in my head for the last couple of days and just wouldn't get out. This may be because I have been playing the Yu-Gi-Oh games lately but here is my story. Also this is my first real story as my HP/Pokemon story is co-written by Sea-Breeze-In-July, so I hope that everyone likes my first story that is by myself. Now I will be using cards up to 5ds because I don't know the cards before that well enough. But the events of 5ds have not yet happened. Though I will be using some elements from 5ds besides just the cards. With that said I don't own Yu-Gi-Oh or Harry Potter. With that lets get on with the story.

Harry Potter was tired. He was tired of all the fighting and all of fear and sorrow that came with war. He was tired of being paranoid and wondering where the next attack would come from. After Harry had killed Voldemort rather than the war ending like he thought and hoped that it would, it instead just grew worse. The Death Eaters and the rest of the dark forces along with a good portion of the Ministry of Magic fought harder against the Order of the Phoenix and the forces of the light. Harry himself had become the Supreme Commander of the forces of light. He had Neville and Ron as his top two generals and right hand men. For a while the light was winning the war against the dark.

That was until an ambush took out Neville and 20 of his men. It was then discovered that the Light had a traitor in their ranks as time after time the dark would ambush the troops and foil their traps destroying the morale of the light. After he had his top spy, Daphne Greengrass, search for who was feeding information to the dark dig to discover who it was he got an answer that left him heartbroken. The spy against the light was none other than Ginny Weasley. He would never forget his and the rest of his friends shock and sadness that one of their best friends and someone who was a high ranking leader would betray them. It hurt Harry a great deal as she was his first love and true girlfriend. They had never gotten back together due to the war growing but he still had feelings for her. They had confronted her and captured her and Harry would never forget what she had said to him when he visited her in her prison.

Flashback

Harry walked into the prison that was built into the Headquarters of the Order of the Phoenix, Number 12 Grimmauld Place. He walked to a cell that was guarded personally by his two of his top elites; the elites were the original members of the DA. The two nodded to him and stepped aside as he opened the door. There sitting on the cot that was placed in the cell was his former girlfriend and a woman that Harry still had feelings for, Ginny Weasley. He just looked at her for a few minutes before he asked the question that was on his mind since he discovered that she was the spy, "Why?" That was all he wanted to know. Why did she betray her friends and family? Why did she betray him?

She raised her head and looked him in the eye and appeared to study him, as if trying to decide if he was worthy of her answering him. Finally she opened her mouth to answer. "Why? Because I have never truly been on your side. I have never stood for the light. I was originally neutral to the entire thing until my 6th year at Hogwarts. That was the year that everything changed. You left me and I was broken inside. You left us all to suffer at the hands of the Carrows and Snape and never once did you help us in anyway. That's when I realized that the so-called 'Chosen One' was not as great as everyone thought that he was. You went on a wild goose chase while we suffered the consequences of your actions. That was when I realized that if you were the best that the light had to offer then maybe the light was not that great and following you would just lead to my death, just like you have had a hand in the death of all your family. Sirius, Remus, Tonks, your Mother, your Father, Dumbledore, all of them have died because of you. Even your friends have died because of you. You would have just lead to my death and I for one enjoy living. So I turned away from the light and accepted the darkness." After finishing her rant she turned away from him and laid down on her cot.

Harry stood their speechless at what she had said and turned and walked out of the cell without another word.

End flashback

Ever since that day Harry had doubts about himself. He had never told anyone what Ginny had said to him when he talked to her and tried to put her words out of his mind, but the words never left his mind and he started to lose confidence in himself. The war just got worst when the muggles discovered the war. After about 2 years of fighting the muggles finally discovered the wizarding world. They did what many wizards had feared that they would do and decided that it would be best to exterminate the all of wizarding kind.

With that a new war had started. This time there were 3 sides, the light, the dark, and the muggles. Harry lost many more friends during this war than the last one. This new war lasted 3 years and was much more bloody. Luna, Seamus, Dean, Lavender, and the Patil twins were killed when the Muggles bombed Hogsmeade after the enchantments around it and Hogwarts broke. Bill, Fleur, and Charlie died during an attack by Death Eaters on the dragon preserve that Charlie worked on while Bill and Fleur came to visit. George, Angelina Johnson, Katie Bell, Alicia Spinnet, and Oliver Wood, all members of the original Quidditch team that Harry was on died during a muggle assault on Diagon Alley. Percy had died along with Arthur during an attack at Ministry. Molly had died shortly afterwards committing suicide. Andromeda and his godson, Teddy, had been captured and killed by the Death Eater.

And the latest two deaths had hit him the hardest. Ron and Hermione had both been captured by muggles and executed publically. He remembered watching as they were laid up to the gallows that had been placed in the center of Diagon Alley after the muggles had taken it over. He remembered watching as Ron held his head high and proud as he walked to his death and looking fearlessly at the crowd, while Hermione also held her head high and proud both ignoring the jeers and insults that the crowd shouted at them. He watched in horror as they had the ropes put around their necks and tightened and the way their bodies hung lifelessly. Their deaths broke him.

Harry just wanted it all to stop. He was sick of it. He wanted life to change. So he searched for a way to change it all. He spent the next 5 years in hiding and searching for a way to change. Finally he came across a spell. The spell would de-age him and transport him to another world. He did not know how much it would de-age him or what the world that he would go to would be like but that was a risk that he would take. Life had become too much for Harry to take so he decide to do the spell.

Harry carefully prepared himself and the room for the spell. It required many runes surrounding a circle that Harry was to sit in to perform the spell. It was time and Harry was ready he sat in the center of the circle and spoke the spell, his voice hoarse and rough sounding from disuse, "mittere me de hoc mundo!", and channeled as much magic as he could into the spell as the runes as circle began to glow a bright white color before with a brilliant flash of light, he vanished. At 27 years of age the battle-worn, paranoid, world weary, Harry Potter vanished.

Seto Kaiba was considered a prideful man and also heartless by some. But in reality he wasn't as bad as some thought he was. He simply didn't care what people thought of him. Also he had reason to be prideful as he owned a huge company and was one of the greatest duelist in the world second only to the King of Games, his rival, Yugi Muto. He got the shock of his life when he walked into his office and found a small bundle of blankets lying on his desk. At first he thought that it was some stupid attempt at a joke and walked over to the bundle of blankets to see what it was. Looking inside he got a huge shock as he saw a small baby sleeping with a piece of paper in his hands. The baby had a tuft of black hair on its head and a small lightning bolt on its forehead. Kaiba looked at the small child in shock with his thoughts racing wildly, 'Why is there a baby on my desk? Who's child is this? What is going on?' were just some of the thoughts going through his head. Now Kaiba was normally a calm, composed person who thought out everything, but it's not every day that you find a baby sitting on your desk.

He took the small paper that was in the child's hand to see what was on it to discover that it only had one word 'Harry' on it. "Hmmm….I would guess that is your name little one." Kaiba mused to himself, he had always had a soft spot for children, "Now what are you doing here on my desk?" Kaiba asked knowing that he would get no answer. Kaiba knew that nobody could get into his office unless he was in there and permitted them to come in so he wondered how the boy could get into his office. Kaiba decide to search the city's hospital computers to see if any children had been born that matched Harry's description. After finding none Kaiba decide to continue searching for anything that could lead him to the boy's parents.

After 3 hours of searching and still finding nothing Kaiba decided that it was hopeless and gave up. He then looked at the small boy and wondered when he would wake up. As if his thoughts alone had caused the boy to awaken, he heard a small yawn and the baby opens his eyes and look at him questioningly. The baby's eyes were a brilliant emerald green color. The baby studied Seto for a minute before giggling and holding his arms out to Kaiba, indicating that he wanted to be picked up. Kaiba lifted the baby up and held him in his arms.

"Hello there little one my name is Seto Kaiba. How did you get in my office?" he asked the small child again knowing that he wouldn't get an answer. Kaiba thought about it and decide that he would take care of Harry, at least until he discovered who the child's parents were.

For the next 2 months Kaiba took care of Harry while looking for any inkling of who his parents were. Mokuba was shocked when his older brother brought a baby home but after Seto explained the situation to him understood and helped his older brother and grew to adore Harry. Yugi and the others also were shocked when they discovered Harry, but again after hearing what had happened they agreed to help take care of him and find out who his parents were. They too grew to adore Harry. Finally Kaiba gave up on the search after discovering nothing. Kaiba decided to have a conversation with Mokuba as he had decided what he would but he wanted to see if Mokuba would be ok with it.

So one night after putting Harry down to sleep he called Mokuba to his office. "What is it Seto what do you want to talk to me about?" Mokuba asked as he sat down in the chair in front of Kaiba's desk. "This is about Harry-"Kaiba began before he was cut off, "What about him? Did you find his parents?" Mokuba asked with a little bit of worry in his voice. Seto picked up on the worry in his voice and inwardly smiled before continuing, "No I have not found his parents. I was actually thinking of adopting him and decided to ask what your opinion of me doing that is. So what do you think?" Kaiba asked his younger brother.

Mokuba looked at his brother for a minute and stayed silent as if thinking before he broke into a large grin, "I would love that Seto!" he exclaimed with joy in his voice. Seto allowed himself a rare smile before saying, "That's a relief, I will have the papers ready by next week." He informed his little brother. With that Kaiba sent his little brother to bed before he called to have the papers set up. A week later Harry officially became Harry Seto Kaiba.

After being adopted into the Kaiba family Harry had become Seto's son. At first he was raised like just about any other baby. Except he had cooler things, even as a baby. Then he started to grow up as only Seto Kaiba's son would. He was taught how to duel at a young age by his father, and his uncles. Harry had a very large extended family. Besides his father and Mokuba, his uncle, he had Joey, Tristan, Yugi, and even Duke Devlin as his uncles. While his aunts were Mai Valentine, Joey's girlfriend, Téa, Yugi's girlfriend, and Serenity, Joey's sister. He had two grandfathers them being Pegasus, who was the crazy, unpredictable one, and Yugi's grandpa, Solomon. He was taught how to duel by his grandfathers, uncles, father, and Mai and was probably the best child at his age group.

Growing up Harry also became somewhat of an adrenaline junkie. It started with him driving his little Yellow Camaro as fast as he could down ramps and it grew until he eventually asked his father if he could build a dirt bike and go-kart track. Seto obliged his request and Harry loved spending any time that he was not with his large family, or studying, on the two tracks. He had even entered a couple of tournaments and won most of times he entered.

While growing up he adopted many of his father's personality traits. When he dueled he transformed into a ruthless person who would try his hardest to utterly destroy his opponents. While not caring at all about his opponents' monsters, he was very fond of his own and would react viciously if they were to be destroyed. He was also very protective of those he saw as family and refused to ever back down from a fight. Another thing that Harry had adopted from his father was his sense of fashion. When he went out with his father he usually wore dark blue jeans, a black sleeveless trench coat with a dark red long sleeve shirt underneath it. He also normally wore a pair of dark blue and black Nike Dunk Highs or a pair of black combat boots.

He was also home schooled and taught by some of the best tutors in the world. By the time he was 13 he could speak German, French, Spanish, Russian, and Latin. Latin was the easiest for him to learn out of all the languages strangely. He was also very interested in computers which his father taught him all about. Unfortunately, Harry took an interest in using his skills with computers to play pranks on people much to the secret amusement of his father, and the not-so-secret amusement of his uncles. But normally he only played pranks on people who annoyed him.

Harry was also had the ability to see duel monster spirits. He could talk to cards and the cards would respond to him and often he could be seen sitting somewhere just talking to cards. It was also discovered that Harry was Psychic Duelist. This meant that he could make the monsters real and inflict real damage. After it had first happened when he was having a training duel with his father when he was 8, Harry became so upset that he hid in his room for the rest of the day until his father assured him that he was fine and that he wasn't mad at Harry. After that Harry had learned to control his powers with the help of his entire family, he only now lost control of his powers if he became very angry. He was also given permission by his father to use his powers to defend himself if he ever needed to.

Harry was also talented on the guitar. He had learned to play when he was 7 and since then loved to just sit around and play guitar. Often if it was raining out, you could find him sitting on a window sill inside the Kaiba Corporation building playing. He had a collection of about 7 guitars. They ranged from electric to acoustic guitars. He had even written a couple of songs but he didn't have the greatest voice so he never sang them.

Another thing that he was skilled in was martial arts. His father had insisted in him learning how to defend himself without the use of his psychic powers. Harry started taking classes in Taekwondo and Capoeira. He wasn't an expert in either of them, but he was good enough to defend himself from anyone who would attempt to attack him. He had never entered any tournaments in either, but he had been recommended by his teachers a couple of times.

Now Harry was 15 and he was finally going to enter his father's school. The Duel Academy. It was on an island in the Pacific Ocean and he would have to take an entrance exam, but he wasn't worried he knew that he would pass. At Duel Academy is where he would start his legend. It was his goal to become the next King of Games and defeat both is father and his mentor. His journey to the top would start in two days when it was time for him to take his entrance exam at the Kaiba Dome.

Well here is the first chapter of my story. Yes this is during GX. Now I hope you enjoy it. Also please PM anyone who has an idea for a deck that Harry would use. I do not want it to be a spellcaster deck and the deck can't have Blue Eyes White Dragon. So if you have any suggestions send me the deck recipe and the strategy on how to use it and I will take it into consideration. I have a couple of ideas for a deck but I want to see what other people can come up with. Another thing is that Harry won't just breeze past people he will struggle in his duels and lose some. He is just better than dueling than most seeing as he was trained by Kaiba, Yugi, Pegasus, and Joey, all 4 of which are great duelist, with Yugi being the King of Games, and Pegasus having created the game so keep that in mind. Also please read and review! Thanks!