Naruto was working the little plot of land that the Hokage had put aside for his garden, when his spade struck something metallic. Digging up the object he'd struck, he found a curious metal box waiting in the hole. Brushing it off, he found a strange eye-like design staring back at him. "Woah... cool..." dusting it off some more he felt a little chakra leak out, and heard a hiss of air as the box opened.
Inside the box was a strange pile of cards with backs covered in a red field, with gold trims and black ovals in the center. Turning them over he found that there were several pictures of monsters, spells, and traps. The traps got his attention, after all, he was a prankster and traps would be a lot like pranking people, and some of those monsters would be fun if he could get them to come off the cards.
He was holding up a pair of cards when one of them started drawing his chakra and glowing. He fell back as a giant brown insectoid thing with a huge mouth of fangs, horns, and blades of chitin on its arms. "Oh shit..." Naruto swore as he scrambled away while the monster continued swinging at him. "KAI KAI KAI KAI MOTHER FUCKING KAI!!!"
What happened was not what he was expecting, instead of the monster disappearing, another one drew in his chakra, and summoned a cute blonde girl in bizarre blue armor with pink ruffles appeared out of nowhere. She looked at the bug monster, and just blasted it away with a glowing ball of energies from her staff.
Naruto looked between the smiling and giggling woman in front of him, and the crater that had once been the bug monster dude. His ten year old mind carefully processed everything that had happened, and then calmly did the only thing it could think to do. It shut down and sent Naruto into blackness.
"Oh dear... that wasn't supposed to happen..." mused the magical girl as she poked the boy with her staff.
Kneeling next to the unconscious boy, she began petting his hair with a huge smile on her face. "He's kinda cute... reminds me of Prince..."
Leaning forward she kissed his forehead and whispered in his ear. "My name is Mana, the spirit of the Dark Magician Girl... I hope you'll be my new Prince..." she whispered softly before pulling him onto her lap and petted his hair gently. A smile spread over her face as she continued petting the sleeping boy.
Meanwhile, across the village, there was cards of another nature being unleashed on the world. Hinata stared blankly at the yellow bear thing in front of her with wide panic filled eyes. "Bear... out... of... book..."
The thing was about to speak, when she fainted and landed on the ground with a solid thunk. Rubbing the back of his head, the bear thing looked down and sighed. "At least this one doesn't have an odd girlish squeal..." Leaping down the bear poked the unconscious girl carefully. "I wonder if this one has a lesbian stalker as well..."
On the kunai throwing range, Tenten let out a loud sneeze.
Back in the library, the bear settled in on Hinata's stomach and pondered what was going to happen next. "Well whoever you are... welcome to the ranks of card captors..."