Still, suspicions aside, he had ninjutsu to learn. The Second Hokage was already dead, after all, and the truth no longer mattered much. He could always ask later, when the Second Hokage was summoned back through the Impure World Reincarnation he had invented himself.
So Shin Uchiha first wrote down the Flying Thunder God Technique from memory, then held his notes in his hands and quietly began studying.
Hmm, this should be related to the Summoning Technique.
Hmm, this pattern should align with space.
Hmm, this part should establish the coordinates of the spatial marker...
Shin Uchiha looked up to check the time. Ten minutes had passed.
All right, that's enough studying for today. I'll go read the Uchiha Clan History instead.
Shin Uchiha-the hopeless student-quietly put down his notes on the Flying Thunder God Technique, declaring that he had given up and would struggle no further. If he wanted to learn something in the future, he would just copy it directly. Otherwise, what had he gone through all that trouble to awaken his Sharingan for?
Shin Uchiha stayed in the space like that, reading for a while, then strolling around the island, all while paying close attention to his body's reactions.
Shin Uchiha could feel an indescribable heat inside him as his body slowly integrated the Wood Release kekkei genkai, leaving him restless and unable to sit still.
He could also feel his body gradually growing stronger, his constitution steadily improving, and the vitality within him increasing as time passed.
Aside from Wood Release, the First Hokage, Hashirama Senju, had been most formidable for the immense vitality within his body, which allowed him to heal without hand seals. Even Madara Uchiha had said that no one could kill Hashirama Senju on the battlefield, precisely because of that powerful vitality.