Ranma and his friends were created by Rumiko Takahashi. Naruto and his friends were created by Masashi Kishimoto. This is fan fiction created for fun.
Author's Note: I've seen other Ranma = Kushina stories, Leaf by Ozzallos comes to mind. None of the ones I've read have progressed very far. I wanted to try my hand at it.
Magic mushrooms again. Ranma sighed. It wasn't enough he couldn't make any progress in his personal affairs, but his trials were starting to repeat themselves. After the failed wedding things went right back to normal. His relationship with Akane kept going up and down. Ukyo and Shampoo never listened to him. Ryouga had mainly backed off, but Mousse and Kuno were just as annoying as always—and worse: boring.
His mother's house had finally been rebuilt after being destroyed by fiancées looking for a rumored engagement ring. He was hanging out there hoping to avoid his fiancées and rivals while waiting for the mushrooms to grow to the right height to return to his correct age. He currently appeared to be 4 years old and his ki was only a fraction of what it should be—not to mention his physical strength.
He was up in the attic of the new house looking at some old things that had been salvaged from the old house. The box he was currently looking through was his mother's mother's things. He found some old pictures that he enjoyed looking at and her wedding certificate—her maiden name had been Uzumaki. The rest was pretty much junk, in Ranma's opinion, other than six things: an odd thin knife with a ring on the handle, a curved metal plate with a spiral engraved on it, three odd scrolls with the same spiral designs on the outside, and a diary. The diary was blank except for the first page that had instructions for one of her descendents to put a drop of blood on the design below the writing. He grabbed the items and placed them in a ki pocket.
It was almost time for his birthday party. The whole circus was gathering at the Tendo Dojo, but he did not feel like participating. He was up on the roof of the Tendo home studying his grandma's diary. It was written in invisible ink which became visible when he put a drop of blood on the design on the first page. If it were to be believed she was from another world! One of the scrolls contained a design called a seal that was supposed to be able to take him there if he put some blood on it.
He knew he should not mess with it, especially in his four-year-old state, but it was getting hard to resist. He could already hear the commotion starting below with people calling his name, already starting to fight over him. He put everything into his ki pocket except the odd blade and the scroll with the world-traveling seal which he rolled out. He impulsively cut his finger on the blade. His family in the other world could send him back, right? They were supposed to be good at this seal stuff, according to the diary. He jabbed his bloody finger at the large, complicated seal on the scroll he had rolled out.
Ranma disappeared with a bright flash and a rush of ki.