Three jet-black tomoe slowly spun within blood-red eyes, radiating an imposing aura.
Those eyes were unmistakably the Sharingan of their Uchiha Clan.
But how was that possible?
"How do you have those eyes?"
Uchiha Fugaku spoke in a low voice, his expression turning utterly grave in an instant.
How could the eyes of the Uchiha Clan appear in someone else's body? Even more inconceivably, the man before him seemed different from Kakashi.
Outsiders paid a tremendous price to transplant eyes with unique bloodlines, such as the Sharingan or Byakugan.
Transplanting the eyes did not mean they could make perfect use of that clan's abilities.
Different bodies and conflicting bloodlines could easily trigger rejection, or even turn the eyes into a tremendous burden.
The boy named Kakashi was one such example. Just one transplanted eye had become an enormous burden.
A transplanted Sharingan could not be deactivated and consumed chakra constantly.
In a tense, fierce battle, that was undoubtedly a fatal weakness.
Yet the man before him could activate his eyes at will. Earlier, he had looked no different from an ordinary person, without anything unusual about him.
"It's merely the use of a unique form of energy, with the bloodline manifesting outwardly through the eyes!"
"That's hardly a difficult problem for me."
River smiled faintly, and after another change, his eyes returned to their ordinary black and white.
"Clan Leader Fugaku, you may have to believe that I understand the Sharingan, and even the so-called Mangekyō Sharingan, better than you do."
Uchiha Fugaku's pupils contracted, and his body shook violently as he stared fixedly at the man before him.
If he had merely been surprised before, the man's words now shook him to his core.
The Mangekyō Sharingan was a closely guarded secret of the Uchiha Clan. Even some members