What Caused His Emotional Numbness

Tsunade did not force Uchiha Ensei to give up. She could not have done so anyway, so she began a series of tests and studies with him on the Ten-Tails' flesh and blood.

At first, Tsunade had been able to offer plenty of help, but the research soon reached a bottleneck.

Really, it was only normal for things to turn out this way.

After all, Tsunade was a medical ninja. It was only natural that she knew a thing or two about the human body, cloning, chakra, Kekkei Genkai, and the like.

But when faced with something unknown, Tsunade's usefulness became quite limited.

This situation made Uchiha Ensei somewhat regret revealing information about Kaguya Otsutsuki to her.

On top of that, Tsunade would occasionally try to persuade him to give up his power, and Uchiha Ensei had already begun considering throwing her out.

As for casting aside someone once they had outlived their usefulness... he did not care about such trivial matters.

Whether Tsunade had sensed his intentions or not, before Uchiha Ensei could tell her to leave, she brought out Hashirama Senju's Sage Art research materials.

At the same time, Tsunade was willing to let Uchiha Ensei sign a contract with the Slug, and he could learn about Sage Mode from the Slug Sage.

The moment Natural Energy was put on the table, Uchiha Ensei was immediately drawn in.

Of course, Tsunade had a condition: Uchiha Ensei needed to give up that power, or at the very least, stop using it temporarily.

Although he had worked with Tsunade for several months, Uchiha Ensei felt that their relationship was ordinary. They could not even be considered friends.

But now, Tsunade was clearly concerned about him. She was even willing to use the legacy left behind by the First Hokage.

Something