Listening to the concern of the girl, he smiled and said "Thank you for your concern beautiful lady. And also thank you for the wish and lightning affinity." The girl smiled and nodded "All right. You will be born as a baby in that world and a slave. You have to endure till you grow up and train to be able to use your fruit abilities and lightning magic. Your magic power will be given in your body that my father will create for you. As that is the world of magic, your body can't exist without any magic. So you will be able to use small magic atleast once or twice until you master the Devil fruit abilities. Now farewell. We'll meet again after your life ends".
Then his soul was once again thrown and started flying in the dimension that it was supposed to. After flying for a long time, he heard a voice "Ah! Finally I found a soul with such killing intent and negative emotions. You must have killed billions. Your killing intent is even greater than me. You will be the perfect candidate. I'll send you into that body using Urashiki's treasure that I acquired. You will be born and destroy that world alongside me. Haha" he then sensed a tug and was pulled into another dimensional gap and lost consciousness. After a long time, he opened his eyes to only find himself laying in a dark slimy place. He understood it was his mother's womb and closed his eyes and started to meditate to pass time till he is born".
Some time back Naruto World....
Isshiki Otsutsuki was about to disintegrate after being beaten by Naruto and fooled by Kawaki. He used his last remaining life force to travel dimensions and activated Urashiki's time device that he had acquired after Urashiki's death from the world. Everything was because of that damn Naruto. He cursed Naruto and travelled in search of a soul with huge negative intent. After a long time, he found a dimensional rift opened by a more powerful being than him and at this time, he saw a soul being ejected out of the dimension which had even higher killing intent than him. He thought 'This soul will do good. He must have killed billions to get such negativity and killing intent. He will be a perfect replacement'.
Isshiki then tugged the soul and spoke some words. Then used Urashiki's device and fused it to the soul and sent it back to Naruto world. He then laughed "Ahahah... Such malice and killing intent. You are a perfect replacement. You will stand alongside me when I destroy that world and take its energy. I'll also consume you after that and gain stronger powers than my clan head and rule the clan and the whole omniverse. Be a good pawn for me. And just you wait Kaguya. I'll be coming back for revenge. Hahahaha". He then started to disintegrate into nothing.
——————————————
Back with the MC, he felt a tugging sensation again and opened his eyes and noticed that he was being born. After some time, he saw light and he was out in the world as a baby again. He shouted something, but only a cry came out of his mouth. Suddenly, blood splashed and he was pulled away. He looked around to see a man with an orange mask holding him and looked to the front to see a yellow haired person with a white cloak suddenly appear out of thin air. He opened his eyes wide and was shocked seeing the yellow haired person that appeared.
Both the yellow haired guy and the masked man spoke to each other and the baby was thrown up into the sky. The yellow haired guy caught the baby and suddenly the scene changed and he was laying on a bed. He was too shocked to think anything until the man came back with a red haired woman and laid her next to him. Then there was an earthquake and a loud rumble and explosion sounds. The red haired woman started speaking and consoling him saying "It's all right Naruto. Minato will take care of everything." And smiled at him. He then started thinking 'Holy shit, I'm Naruto? What happened to the magic world? Why am I in Naruto world? I think that I heard the name Urashiki when I was drifting. I didn't think much at that time. Must be related to this. Who was that?'
He was brought out of his thoughts when Minato suddenly appeared and took Kushina teleporting from the room. Then after some minutes, Minato appeared again and took him too. The scene changed and he saw the huge fox being held by chains. Then Minato spoke to Kushina about sealing half of the fox inside him to which she refused, but ultimately accepted as she couldn't hold on much longer. Minato used shīki Fujin and sealed half of the fox in himself. Then the fox tried to attack Naruto to which Minato and Kushina took the blow. Finally Minato sealed the other half of the fox inside Naruto. It was a burning sensation and painful, but he endured as his mind was much mature and had great pain tolerance.
Soon the Third Hokage arrived at the scene. Kushina seeing him crawled towards him and said "Please take care of Naruto. Minato said he will be called heroe by the people of the village and you will take care of them." as she cough and little amount of blood came out of her mouth. "Don't worry I will look after him and make sure he grows up well." Hiruzen said as he looked at the mother who is trying her best. "Thank you. " Kushina said as she looked at Naruto and added, "Grow up well and try to forgive mommy for leaving you alone my little angel." as she falls on the ground lifeless with a sad smile on her face.
After she was dead several Anbu came behind Hiruzen. "Lord third." One of the Anbu said looking at Hiruzen and the now dead fourth Hokage. "The fourth Hokage is no more." Hiruzen said as he picks Naruto up on his arms. He than sighed shaking his head and went back to the village carrying Naruto. Naruto, even if he had destroyed and killed an entire world population, couldn't help but shed a tear seeing the dead body of Kushina. He didn't care about Minato as he sacrificed his life stupidly for the village which betrayed him. But he took Kushina with him and made his child a jinchuriki for it to suffer.