Yin-Yang Space-Time Seal

Ninjutsu research was rigorous. After unremitting effort and countless experiments, Mito finally determined that none of the existing Sealing Techniques could create this kind of scroll.

A powerful, entirely new Sealing Technique was required, and new materials would have to be found as well. At the very least, ordinary dawn redwood bark would not do.

Afterward, Mito plunged headfirst into the vast sea of books. Developing a new Sealing Technique was no easy task; at minimum, it had to surpass S-rank seals by far, or it would be utterly incapable of sealing something as miraculous as time.

Shin naturally went along to help. Though he was not particularly skilled in Sealing Techniques, as one of the Three Gods of the Warring States Period, his mastery of ninjutsu was undoubtedly at the grandmaster level. The ninjutsu he exchanged from the system also needed to be developed and applied, and Shin had worked hard in this field since childhood.

When the Uchiha left, Shin took away quite a few of their books. Together with the materials Mito had collected herself and the various Sealing Technique documents developed by Akatsuki, it truly formed a vast sea of books.

Naturally, most of the materials were useless, but that was how ninjutsu development worked—tedious and dull.

It took the two of them roughly three months to go through all the materials. Shin even took her inside the moon so she could experience the Tenseigan's power firsthand.

After returning, Uzumaki Mito chose to enter seclusion. She even drove Shin out and locked herself alone in the room.

Another long two months passed.

When Shin saw Mito again, she looked exceptionally haggard, though a faint smile had appeared on her face.

Shin hurried forward to support her and asked with concern, "Are you all right?"

Mito went