After deciding to keep Kakashi entirely on the Sky Fortress and not let him come down until his training succeeded.
Hyuga Sho began to take care of other matters.
Meanwhile...
Somewhere in the Shinobi World.
"Kamui...!"
After obtaining Hatake Kakashi's Sharingan—or rather, recovering his own eye—Uchiha Obito once again used Kamui on his target.
However.
This time, Kamui was no longer being used to make himself intangible.
Instead... it was an attack!
The rock distorted by Kamui instantly took on a spiral shape.
Even space itself was affected.
The next moment.
As if swallowed by the void.
The massive boulder was forcibly gnawed into a huge hole.
Looking around.
The entire mountain was covered in similar marks.
Clearly, after getting his eye back, Uchiha Obito had put it through extensive training.
"Hatake Kakashi, that useless fool...!"
Uchiha Obito's face was gloomy.
He truly hadn't expected Kakashi to be that hopeless.
Being weak was one thing.
But his eye development was completely at zero.
He had clearly awakened the Mangekyō Sharingan back then.
Yet he hadn't used Kamui even once.
Fighting only in the Three-Tomoe form was simply a waste of a precious resource.
And so...
"He wasted so much of my time!"
Uchiha Obito had awakened his eye many years ago.
After using it for so many years, he had already mastered the various properties and information regarding the Mangekyō Sharingan.
Among them...
The setting that "the Mangekyō Sharingan increases in proficiency and power with the number of times it is used, ultimately creating a vast difference from a beginner" was strictly observed as well.
Because Hatake Kakashi's progress was at zero.
He had needed to undergo more than ten days of training.
Only then could he raise this eye's proficiency to a decent level.
After glancing at the marks