Disclaimer: I am not within ownership of the characters, storyline, and especially the series, Ojamajo Doremi. This story also mentions and uses characters from Yu-Gi-Oh, to which I also do not own.
This is not an official crossover, but rather it uses combined aspects of both, as though they existed within the same continuity.
"My draw!" Momoko shouted, as she pulled a card from the top of a deck, which was on a mat which was on her desk. The card she pulled was then placed in her hand, making it a sixth card, she looked at it, and released a smug smile. "I set this card, face down, and end my turn!", she said, setting the card face down in what the mat labeled as a "trap/spell zone".
She was playing a card game with one of the boys from the next class over. The boy was wearing a t-shirt, and his hair was blonde and spiked up with hair gell. He pulled a card from his own deck, which was placed on the opposite side of Momoko's, he had about three other cards in his hand, and he set one of them, face up, in the 'monster zone', "I summon 'Baron of the fiend sword', and attack you directly!", he shouted, to which Momoko simply flipped up the card she set, which was a purple one, labeled 'Magic cylinder'. "Too bad, you lose!", Momoko said, after counting up the numbers.
The boy simply slumped his head, and spoke to her, "Heh... you win." he said, picking up his cards. "Play again some other time?", he asked, "Sure, why not?", Momoko responded. Doremi was watching in awe, she simply loved almost everything about the game. "You won! You have to teach me this game sometime! Please!", Doremi said, pulling out a couple of cards.
Momoko looked at it, and said "Ok, can I see what you have there?", Doremi smiled and handed the cards over, there were at least 70 of them, and Momoko skimmed through. The expression on her face went from a smile to a slightly confused look, "Do you have a strategy of any kind?", Doremi smiled, and said "Yeah! They're all cute, and their colors match!", to which Momoko simply dropped her head, still looking through, and asked "You're a beginner, aren't you?", Doremi nodded, "Yeah, I've never played, but I've got a bunch of cards already. I've been collecting for a little while now."
At one point, Momoko started to get very shocked, pulling out a card, and showing it "How did you get 'Injection fairy Lily!?! People look all over and spend a ton of money for this card!", this caught the attention of the almost empty classroom, who stared at them, until they went back to their usual buisness. "Like I said, I've been collecting for a little while." Doremi said, talking about her collection.
She pulled a box out of her backpack, which was full of cards as well. Other students, such as the normal otaku from their class, and even some students who they had no idea were into such games, ran over to look at them. Some of them were from the Baseball club, and there was even one from the Soccer club... upon closer inspection, they noticed who it was, and said his name out loud... "Kotake!?!"
It was true. Kotake was among them, but the only reason why he stood out in the small crowd was because it was so unexpected of him. He blushed, "I'm just checking out how lame this card game is, you're into this too Dojimi?", he said, taunting almost everybody there. This would have been good, except for the fact that one of the surrounding students could see right into his backpack, which was left unzipped. The student reached in, and pulled out a metal device.
The device could be placed on one's wrist, on their left arm. It had card slots on each side, which cards could be placed on. There was two on one side, and three on the opposite. The student pressed a button, revealing it's transformation into what many student's knew as a 'duel disk', which was made with the sole purpose of being able to play the card game, using state of the art hologram technology. The student was Yada-kun, and one could see that he was slightly shocked by the transformation sequence.
Everybody saw it, and Kotake blushed. Doremi and Momoko simply gave a smug smile. "So... the game is lame you say? It looks like you've been playing...", Doremi said, "Not just playing... but playing in tournaments!", Momoko added. Kotake took the device back and shoved it into his backpack. "Ok, fine... there are cool people who play it...", he stated, Doremi nodded and added, "Yeah! Like Yugi... oh...". She had stars in her eyes, a smile on her face, and apparently, a dream in her head. Now the world knew all of her reasons for wanting to play.
The vision in Doremi's head was very akward... she imagined herself standing on the edge of a rectangular platform, with a computer in front of her, made for placing cards, on the 'red side' of a type of dueling arena. Her challenger, in the darkness, falls in defeat, and she is given a golden trophy in the shape of a cup, which would probably be about her height, if not higher. She started speaking in her dream, and out loud, "I'm gonna be the princess of games!". Everyone there had different versions of what she had imagined, in their own heads. However, the only one who was even remotely close was Momoko, who's version was very similar, except with a colleseum in mind.
"Aaahh... so cool... I would be such a cute princess!", Doremi stated, Momoko's head dropped and she let out a small sigh. Not too far from them, a young man listened intently, and thought very deeply about those cards. The boy wasn't from their class, probably from another one not too far, but he was about the same grade. He walked by and slipped an envelope into Doremi's backpack, and left without saying a word. Momoko started giving tips on cards, both unaware of the message Doremi had just receieved...
"Ok, I think your deck is ready, and you'll be able to start dueling soon", Momoko told Doremi. Momoko's lecture was pretty general, explaining rules and regulations, also talking about how certain cards work, and used her own deck as an example. "Ok, now that we know about cards, let's start with gameplay.", Momoko said, Doremi replied "Alright! Let's get it started!"
Alright... I think that's a good point to leave it for now... who was that mysterious student? What did he put in Doremi's backpack? And why am I asking you!?!