Naruto: Getting Stronger by Drinking

Tsunade watched Itachi Uchiha, who looked like an inchworm, with some amusement before turning an incredulous gaze toward Yuu.

When it came to understanding the Mangekyō Sharingan, Tsunade was undoubtedly the most knowledgeable person besides Yuu.

As the granddaughter of Hashirama Senju, the First Hokage, and a descendant of the Senju Clan, her understanding of the Uchiha Clan was beyond question!

The Senju Clan and the Uchiha Clan had been mortal enemies during the Warring States period!

Neither side knew how many years they had spent studying the other.

Within the Senju Clan, records concerning the Uchiha Clan accounted for nearly half of all the clan's archives!

Their records of the Sharingan, the Uchiha Clan's greatest pride, were even more detailed.

As for the Mangekyō Sharingan, the Senju Clan had detailed records of every one that had ever appeared in history!

Tsunade understood very well just how terrifying and rare this dōjutsu was.

Even during the brutal, war-torn Warring States period, the Mangekyō Sharingan had been extraordinarily rare!

Under such circumstances, it was only natural that Tsunade was astonished that a brat like Itachi Uchiha had awakened the Mangekyō Sharingan.

Moreover, according to the Senju Clan's records, not a single member of the Uchiha Clan had ever awakened the Mangekyō Sharingan while on the brink of death.

Yuu had essentially pioneered a new method for awakening the Mangekyō Sharingan!

This was revolutionary for the Uchiha Clan and for the entire Shinobi World!

Of course, only Yuu could use this method.

After all, no one else could repeatedly drag someone back from the brink of life and death.

Even she had lost count of how many times Itachi Uchiha had been at death's door.

If members of the Uchiha Clan tried this method on their own, they would not even know