After Tetsuya stole the Scroll of Seals and fought the Sannin in Konoha, Konoha High Command identified the mysterious Masked Man, Tobi, as a former guard of the Second, Tobirama. In other words, they had concluded that Tobi was Kagami Uchiha.
Given the complexity of the situation, Konoha decided to withdraw all its ninja from the Land of Rain and end the war once and for all.
Yet tragedy still struck. Tsunade's boyfriend, Dan Katō, who had mastered the Spirit Transformation Technique, died on the battlefield. The gruesome state of his body chilled anyone who saw it.
After witnessing Dan Katō's death firsthand, Tsunade developed hemophobia.
The Second Shinobi World War thus came to a definitive end, though its conclusion was somewhat abrupt, sowing the seeds of the Third Shinobi World War.
Konoha, inside one of Root's secret research facilities.
Orochimaru studied the material he had copied from the Scroll of Seals, occasionally sticking out his long tongue to lick his lips in his overwhelming excitement.
"Splendid! This is simply marvelous. So this is the Impure World Reincarnation Jutsu? A technique that can bring the dead back to life. Truly marvelous."
In his excitement, he set down the scroll he had copied and picked up another to write on, muttering questions to himself as he wrote.
"But this technique still needs refinement. Lord Second, with your wisdom, you shouldn't have left behind an incomplete technique. Why didn't you finish it?"
Still, he could more or less guess what had happened. Needless to say, that "benevolent" First must have stopped the research into this technique.
After all, the technique not only disturbed the dead but also required living sacrifices. Given that man's disposition, he would never have allowed such a technique to exist.
"But that doesn't matter. I will perfect this