Just as Ranma is finishing of Saffron, releasing a tremendous amount of energy ripping a tear in the dimension, Naruto had just used a suicide technique from the forbidden scroll which got out of hand and also tore into the dimension. Kyubi merges the remains of Ranma and Naruto forming Ranko, who due to a mistake is fully female and is mostly Ranma with Naruto’s memories. When she wakes she joins a team of Kunoichi, ready to protect her new home. (Naruto Crossover.)