Without a doubt, while inside Hyuga Kagami's body, the pair of Tenseigan had been very self-aware. They carefully protected Hyuga Kagami's body, even suppressing themselves and entering dormancy rather than placing a severe burden on him.
But after being transplanted into Neji, that self-awareness seemed to have vanished.
They had finally revealed their "Six Paths-level" status, displaying a might no less formidable than the Rinnegan's—perhaps even greater.
Neji's current condition clearly showed that he could not bear the burden of the Tenseigan. His eyes and body were rejecting each other!
And in this struggle of rejection, Neji's body was simply no match for the Tenseigan. The two were on completely different levels, which was why Neji was in such excruciating pain.
"Not even Neji can handle them?"
Hyuga Kagami felt somewhat helpless.
If even Neji could not do it, then Rin, whose aptitude was somewhat worse, probably would be even less capable of bearing his Tenseigan.
At that moment, with the complete release of the Yin Seal, Neji's condition improved slightly. Drenched in sweat, he clutched his head and panted heavily. "Sensei, why are your eyes so terrifying?! They... they're like the sun, so scorching that I can barely endure them. I feel like my head is about to split apart!"
As Hyuga Kagami considered a solution, he casually replied, "Didn't I mention it before? My eyes are called the Tenseigan. You can think of them as an advanced form of the Byakugan!"
"Ten... Tenseigan!?"
Neji was struck dumb, as though hit by lightning.
He had always believed the Byakugan had no advanced form. Only after hearing Hyuga Kagami's explanation did he realize that, like the Uchiha Clan's Sharingan, the Byakugan also possessed an advanced form.
And his teacher already possessed these powerful, almost terrifying eyes known as the Tenseigan.