Tobirama Senju had recently experienced a sudden surge in strength. It was as though something had clicked in his mind, and he began developing forbidden ninjutsu one after another.
All of this was because he had discovered a notebook at home.
It was written in mysterious symbols that did not belong to the Naruto world's script.
Inside were annotations deciphering half of its contents.
This was the notebook Indra had deciphered all those years ago.
After he split from Ninshu, it had originally been brought to the Uchiha Clan.
But the nearly thousand-year war between the Uchiha and Senju Clans
had eventually left the notebook in the Senju Clan's hands.
And now, Tobirama Senju had discovered it.
He had expended tremendous mental effort deciphering the mysterious writing.
Only then had he learned one of the ninjutsu within.
The Flying Thunder God Technique! Only with it had he managed to defeat Uchiha Izuna.
At first, he had not believed the notebook, because most of the ninjutsu recorded within sounded like sheer fantasy.
Reaper Death Seal? What a joke. How could a God of Death exist in this world?
And even if a God of Death existed, how could mortals possibly command a god?
Impure World Reincarnation was even more absurd.
The dead could not return to life. That truth had been passed down since ancient times.
How could human power possibly reverse life and death?
He was no transmigrator. The teachings he had received since childhood were deeply ingrained.
Naturally, he would not believe such things easily.
So he had chosen the comparatively plausible Flying Thunder God Technique from the notebook.
He had never expected...
Tobirama Senju had been so overshadowed by his elder brother's dazzling brilliance that he could barely breathe.
For over a decade, he had been unremarkable, with