A long time ago, a demon fox with nine tails existed. When these tails were swung, they could destroy a mountain and cause a tsunami. To counter it the villagers gathered some ninjas…
(On The Battlefield)
The ANBU, Jounin, and Chunnin of Konohagakure No Sato were going all out in their fight against the great Kyuubi No Yoko. The forest in which they were fighting was littered with the heavily beaten dead bodies of ninjas. Many of these bodies were torn apart, others were crushed into the ground from being stepped on by the great fox or partially eaten. Among the many casualties were men, women and children who weren't shinobis and this was to continue if Kyuubi wasn't stopped.
"We have to hold it off until Yondaime arrives," yelled on the injured Jounin before he charged back into fighting Kyuubi.
"…Don't let it get closer to the village…," yelled another injured Jounin kneeling down do catch his breath before he also charged back into action.
Moments later, a giant reddish brown toad known as Gamabunta was seen making its way through the forest toward the great red nine-tailed fox, with a most familiar blond haired shinobi dressed and geared like a Jounin standing on its head wearing a white trench coat with flame designs on the bottom of the coat. This shinobi's presence was a sight for sore eyes to everyone who saw him, except Kyuubi. This shinobi was Namikaze Minato, also known as Yondaime Hokage.
The great nine-tailed fox growled viciously as he stared straight at Yondaime. Seeing the fox in range, Yondaime began performing a series of complex hand seals beginning the process of sealing the fox away. The Kyuubi however dashed at Gamabunta in the attempt to kill Yondaime. Seconds before the Kyuubi reached Yondaime however, a brilliant flash of white light blanketed the forest blinding all who were there. After several moments, the great light died out returning sight to everyone. Kyuubi No Kitsune, Gamabunta and Yondaime were nowhere to be seen. The fighting was over and Kyuubi was finally defeated, but at a great cost…
(Meanwhile)
Sarutobi Hiruzen, also known as Sandaime Hokage, was in an undisclosed chamber with a crying newborn infant boy resting on a cushion on the ground with candles ceremonially arranged around him. Three Anbu were also present with Sarutobi. Hiruzen suddenly sensed a very strong chakra making its way toward the baby. He sighed sadly to himself, knowing that Yondaime successfully performed the forbidden sealing jutsu, which cost him his life. The chakra sudden burst into the chamber and made its way into the baby's stomach. Seeing this chakra however alarmed Hiruzen. The chakra being infused into the baby wasn't red as anticipated. Instead, this very strong chakra was blue and it gave off a most familiar aura.
With a flash, the blue chakra was completely infused into the baby boy, thus completing the sealing. The baby was still crying with a seal on his belly glowing in a majestic blue glow. Hiruzen hurried over to the baby and saw that a most unexpected event have just take place.
"…Oh my…," the shocked Hiruzen spoke quietly, "This was most unexpected…How could this have happened…"
One of the ANBU stormed into the chamber and went over to Hiruzen.
"Sandaime-sama, Kyuubi is gone and so is Yondaime Hokage! The sealing was a success, yes?"
Hiruzen sighed to himself and spoke, "Yes it was a success. However the Kyuubi wasn't the one that was sealed into Naruto."
This revelation greatly alarmed the Anbu who were present.
"Sandaime-sama! You mean the Kyuubi is still out there!"
"I don't know what became of Kyuubi…however I know what became of Yondaime…"
The ANBU wanted anxiously for Sarutobi's answer.
"He was sealed away into his own son…"