At Clan Leader Shin's words, Uchiha Itachi seemed to remember something and asked hesitantly:
"Train hard to improve my mental strength, eye power, and physique?"
Shin Uchiha nodded at that and said:
"That's right. It really is that simple. Focus especially on your mental strength and eye power, and work hard to raise their limits. Of course, your physique should ideally keep pace as well.
"Once your mental strength and eye power meet the requirements, your Mangekyō Sharingan will naturally evolve into the eternal Mangekyō Sharingan."
Seeing how utterly at ease Clan Leader Shin looked, Uchiha Itachi suddenly felt a headache coming on. An ominous suspicion crept over him, but he still refused to give up and asked:
"Clan Leader, is there a benchmark? For example, how much do my mental strength and eye power need to improve to meet the requirements?"
Shin Uchiha rubbed his chin, frowning as he recalled:
"About three to five times what they were when you awakened your Mangekyō Sharingan, I think. Yes, that sounds about right."
Shin Uchiha's words left Itachi completely speechless.
Uchiha Itachi had awakened his Mangekyō Sharingan five or six years ago. Over those years, his physique and chakra had improved considerably.
But his mental strength had only surged when he awakened his Mangekyō Sharingan. Once it stabilized, never mind multiplying it several times-an improvement of even ten percent would have made him laugh in his sleep.
As for his Sharingan's eye power, it had not increased in the slightest all these years.
Uchiha Itachi immediately ruled out this method.
No wonder Shisui had looked a little strange when he mentioned it, and had not particularly emphasized it. It seemed Shisui might be in much the same situation.
At that thought, Uchiha Itachi suddenly remembered something else. With a subtle change