Naruto 504: Thank you

Minato sealed half of the Kyubi's  chakra to himself.  

source: www.mangastream.com

As Minato was about to seal the Kyubi to Naruto, the Kyubi suddenly forces itself to attack the baby Naruto. Minato and Kushina shielded their son. Minato asked Kushina to say her final words for Naruto. With a heart breaking scene of  parents leaving their child, Kushina tells Naruto to eat well, sleep on time, never barrow, and a sort of things. Has only few words to spare since Kushina said it all, that is to look for true friends.

Minato seals the Kyubi to Naruto and both of them banished. 

Kushina was about to disappear thus she said her final thank to Naruto. For being tough inspite of not having his parents around to help him face the harsh world. Kushina is now fading and tears of joy for both of them rushes. Naruto thanks both his parents who were only with him for just a moment.

Naruto 503: Minatgo's Dead Demon Seal

source: www.mangastream.com

Minato's Rasengan wounded Madara. Madara finally realizes that he is not match to the Fourth Hokage who is able to wound him and take control of the  Kyubi.

The third and the villagers were able to drive out the Kyubi outside the village. Minato rushes back to Konoha to deal with the Kyubi. A plan came to his mind, a plan to seal the Kyubi. He came just in time and he teleported himself and the Kyubi away from the village. Out of nowhere Kushina appeared with Naruto. Kushina planned not to waste her life. She planned to drag the Kyubi with her death. 

Minato told Kushina of his plan and ask her to save some of her chakra so that when the right time comes they can both see Naruto in her teen years for the first and the last time. Minato remembered Jiraiya sensei's dream of finding the chosen boy who will save the shinobi world. And he is placing his faith in his son. In order to do that he will ahve to seal half of the Kyubi's chakra whith him and the half to Naruto.  

The Kyubi realize's Minato's plan and started to struggle against Kushina's barrier.

Naruto 502: The Fourth Hokage goes to War

source: http://www.onemanga.com/

After saving both Kushina and Naruto, Minato left to defend his village from the Kyubi and the masked enemy.

The village felt the strange thing and they knew that a bad thing was about to happen. From nowhere the Kyubi suddenly came out and started wrecking havoc to the village. Minato was able to teleport one of the Kyubi's big chakra attacks. Then the masked enemy tried to trap Minato in illusion but was able to teleport. He was able to lure the masked enemy, believed to be Madara himself, after figuring that the Kyubi follows the order of Madara. 

In order to save the village Minato has to defeat Madara. Using his super speed techniques he charges to attack Madara hand on hand after trying jutsu's which has no effect to Madara. By using his Haraishin at level 2, Minato was able to surprise Madara with a behind attack.

Naruto 501: The Nine-tails strikes

source: http://www.onemanga.com/Naruto/

As Kushina was about to give birth to Naruto, Madara showed up in the secret place. Naruto was born and was taken by Madara making Minato in trouble. He has to chose either to save Naruto or to help Kushina in preventing the Kyubi from escaping from its vessel.

Minato saves Naruto and realize that Madara's plan was actually to get Kushina to get the Kyubi. Madara was able to get the biju and heads to Konoha. Minato transported Naruto to a safe place and went back to save Kushina. After getting Kushina, Minato prepares to stop Madara and the Kyubi.

Naruto 500: The Birth Naruto

 source: http://www.mangaspoiler.info/

Naruto's mother, Kushina, tells how Naruto was born and the reason why 16 years ago the Kyubi was use to attack Konoha. 

Kushina was the second Jinchuukiri. Kushina was from the Eddy village's Uzumaki clan which is a distant relative of the Senju clan of Konoha. Kushina's clan were known for their longevitty and sealing techniques thus a young girl from that village was chosen to be the vessel of the Kyubi. The first Jinchuukire of the Nine-tails was also form the Uzumaki clan which was Uzumaki Mito the First Hokage's wife. Kushina felt the same disbelief and sadness just like Naruto but a word from the first Jinchuuriki made a big difference. She said that they must fill the vessel with love. 

Madara knew about the moment when a female Jinchuuliri's seal is weakest that is childbirth. Thus upon the birth of Naruto, Madara showed up in the secret place for Naruto's birth. He threatened to kill Naruto unless Minato dont seal the Kyubi inside Kushina. And the attack at Konoha happened starting the Ninja war.