Watanabe Ichiro began his life in Root, burying himself in its archives to study Sealing Jutsu Formula on his own.
Although he had barely studied Sealing Jutsu before, he was a system-backed cheater.
He dug out Introduction to Sealing Jutsu Formula, crammed the basic knowledge into his head, and began learning elementary formulas. He read them, understood them, then etched them directly into his system as skills.
Whenever he wanted to use one, he simply pressed a skill button on the system panel with his mind, just like Flying Thunder God. Easy and straightforward.
He got the basics down in three days and mastered the intermediate level in five, only to hit a wall with advanced Sealing Jutsu.
As their effects grew more powerful, the difficulty of Sealing Jutsu increased exponentially. Watanabe Ichiro could not make sense of those intricate incantations.
To enter something into the system, he first had to understand it. If he could not make sense of it, there was little he could do. He went straight to Shimura Danzō and asked for a teacher proficient in Sealing Jutsu.
Shimura Danzō came through, too. By the next day, Watanabe Ichiro had a teacher lined up.
His teacher was Hashirama Senju's widow-Mito Uzumaki.
Watanabe Ichiro did not know her very well.
Although Uchiha Ichiro was nominally the shared disciple of Hashirama Senju and Tobirama Senju, and ought to address Mito Uzumaki as his master's wife, she rarely left her home. They seldom encountered each other, had little relationship, and had barely even spoken.
However, according to Teacher Tobirama, her greatest hobby was researching Sealing Jutsu Formula. Several upgrades to the Konoha Barrier had depended on this master of Sealing Jutsu.
And since this world did not require her to bear the Nine-Tails as a jinchūriki, Mito Uzumaki had