After years'
After the joining of the Uzumaki clan into the Hidden Leaf, many wars went smoothly. Konoha suffered less and less loss due to the seal masters of the Uzumaki clan, where now there are some things changed, some did not even in the AU. The Fourth Hokage, Minato Namikaze, married the clan head's daughter, Kushina Uzumaki. Now she bore their child.
After nine months had passed since the kaiju attack...
Kushina gave birth in a room with only a few Uzumaki women. One woman controlled the seal to make sure that the seal wouldn't break, but suddenly a masked man appeared and took the baby in his hand.
The masked man said, "Get away from the woman if you don't want the child to die."
All the uzumaki women left as minato used his haraishin to tp to naruto and save him, but in that time the masked man attacked Kushina and left. Minato went to the clan and kept the children there, but then shivers went down his spine as he heard the roar of the demon fox. He quickly rushed and teleported a bijuu dama amaterasu right at the village. Then he went to the masked man and beat the living hell out of him with the cannon rasengan and harashin combo, meaning while the members of the uzumaki clan called the current head of the clan and the third hokage went to battle the nine-tailed fox. The head was holding the fox with his chains, but there was a problem; he couldn't hold it forever. Just then, minato used a giant rasengan into the fox as it screamed in pain.
The old head " Minato i can't hold him for much longer we need to seal it back can Kushina do it"
Minato said, "Kushina is barely alive; the medics are treating her, but she won't survive if the Nine-Tails is sealed into her."
Old head "Hmm, but if that thing is sealed into someone with a stable chakra network, it would be destroyed."
Minato said in a said tone, "Then I have to do it."
Hizuzen asked with a worried face, "Don't tell me you're going to seal it in Naruto."
Minato answered with regret, "If I can't seal it into Naruto, then how can I ask someone to give me their child? I have to do it." He dispersed in a flash and went to the clan compound in the room where Kushina was sitting next to Naruto, holding him and in a sleep, Minato gently grabbed the boy and lifted him even though Kushina was asleep from the exhaustion, she still held onto Naruto tightly. Minato's heart sank as he took the baby and teleported to the Fox. The old head of the clan was about to faint. Minato quickly started the Reaper Death Seal. Hiruzen stopped the young Kage and said, "Minato! Stop. Let me do it. You are still young; your son has every right to be with you. I won't let you take from him.
A young infant, I have grown old and have seen three great wars. I have fulfilled my duties in this world; let me die now, knowing that there is someone to protect the village. Let me fulfill my last duty to this village." As Hiruzen said, so he went through the hand signs and the Death Reaper took the soul of Hiruzen and sealed the whole of Kurama into Naruto. This marked the death of the Third Hokage and the birth of a legend.