Jiraiya sighed as he thought about his godson whom he haven't seen or talked to once. He didn't even write to him or inquired of the Hokage of Naruto's life or treatment in the village. The Sannin knew who his parents were and that Naruto was the Jinchuuriki of Kyuubi. He knew Naruto's parents died in Kyuubi's attack, being the ones that personally stopped Kyuubi and died in the process of doing so. Jiraiya often though about making contact with Naruto but never actually made the time to do so. He always put his godfather responsibilities on hold and placed being a ninja in higher priority. He did this while continuously tracking Orochimaru and keeping tabs on a newly formed organization rising, the Akatsuki.
Recently, Jiraiya received word from one of his informants in his spy network that Orochimaru came through the country once known as Uzu No Kuni. Jiraiya was told that Orochimaru was in search of something but what the traitorous Snake Sannin was looking for was unknown.
The Toad Sage decided to investigate and see what was in the desolate land that drew Orochimaru's attention. Jiraiya spent two days looking through the remains of the country but found nothing; every lead was a dead end.
"This is proving to be a waste of my time," Jiraiya muttered was he left one old building and traveled to another. He walked into an old house that was in ruins like all the others. After walking around, Jiraiya was about to leave when his eyes caught something. There was an opened door that led to a room that looked to be a book room at one time.
Going into the room, Jiraiya entered and found that on the floor was the Uzumaki familial seal with blurred writings around it. The Sage focused chakra into it and to his surprise the seals and the spiral crest glow and dispelled, revealing a secret door that led to an underground cellar.
"This should prove to be interesting," Jiraiya said as he journeyed into the cellar. Performing a fire jutsu, Jiraiya made a torch for himself to see through the darkness. Reaching the bottom, the Sannin walk through a short hallway and found a closed door before. Breaking the door open, the Sage looked into and saw old withering scrolls resting on shelves all around. He looked through the scrolls but saw that the writings were too worn out to be understood properly. Others deteriorated from aging.
After an hour, Jiraiya decided to leave. As he did, again something caught Jiraiya's attention. To his right was a relic wrapped and tied in cloth. Going over it, Jiraiya picked up the covered relic and found the kanji for "Legacy" written on it. Untying and unwrapping the relic, the Sage found that the artifact was in fact ancient scroll of some sort.
"I wonder what's in this," Jiraiya said out loud. He wondered this as he untied and opened the scroll, only to find that he couldn't read the writings in it. The seals written in the scroll were far more advanced and complex in nature. They were unlike any seal Jiraiya had ever seen. In the center of the seals were sophisticated seal drawings made in a pattern to form a spiral design representing the Uzumaki clan crest.
"Truly the work of a true seal master," Jiraiya said as he studied the writings, "No doubt it was an Uzumaki clan leader from long ago who designed and made this seal."
Closing the scroll, Jiraiya placed the scroll inside his vest and left the cellar. With nothing else to find, the Toad Sage departed from Uzu No Kuni.
(One Year Later)
Jiraiya spent many sleepless nights trying to study and interpret the ancient scroll. Even the toad sage Fukusaku was at a lost trying to interpret the ancient seals and many books both Jiraiya and Fukusaku researched had no information on the seals. It was at that point that Fukusaku told Jiraiya that the seals were heavily encrypted and that the people in the Uzumaki clan from long ago who created the seals didn't want it discovered for reasons unknown.
That however led to Jiraiya's curiosity to be heightened even further despite Fukusaku's warning about tampering with ancient seals that they had no information on. But after a great deal of effort, Jiraiya was finally able to decrypt and unlock the seals, allowing him to read the writings that were penned into the scroll. From what Jiraiya learned from his heavy research into the seals, he found that the seal drawings went as far back to seventy to ninety years after the death of the Rikudō Sennin. Thus the Uzumaki seal masters of that time were close in descend to the second son of the Rikudō Sennin
The sage spent a number of nights reading the scroll and the intricate hand signs that went with the seals. It took Jiraiya five months to understand the seals and the hand signs but he final caught on to the sequence.
Wanting to know what the seal could do, Jiraiya decided to test it out. In an isolated forest cut off from civilization, Jiraiya decided to test out the ancient seal jutsu that night. Setting the scroll down on the ground, Jiraiya saw that the needed amount of chakra required for the jutsu was very massive. Clearly this was no ordinary jutsu and anyone attempting it without the required level of chakra would die from chakra exhaustion alone. Acknowledging this, Jiraiya summoned Fukusaku and his wife Shima and merged with them in order to go into Sage Mode. He decided to use Sage chakra for the jutsu ōgi.
"Jiraiya-chan," Fukusaku cautioned, "I'm still wary about the use of this seal. The very fact that you even summoned us in order to use Sage Mode for this fūin jutsu is alarming enough!"
"Without a doubt," Shima added, "This ancient seal is an S-class jutsu ougi! Whoever this Uzumaki seal master was that created this seal must have had Sage-level if not bijuu-level chakra! Then again, the Uzumakis were renowned for their massive amount of chakra."
"There must have been a reason why this jutsu was created," Jiraiya replied, "What I want is to discover what it can do."