The System's Last Hope: Binding Tobirama Before the Massacre

【Clan Extermination Countdown × Bound to Rival's Template × Uchiha with Senju DNA】

Eiji woke up transmigrated as an ordinary Uchiha clansman, only to receive a system notification right away:

「In three years, your entire clan will be slaughtered by your own brother.」

Just as he was contemplating drowning himself in the Naka River out of despair—a golden light flashed—

[Ultimate Template System Activated! Bound Target: Tobirama Senju!]

From then on, by day he studied Flying Thunder God markers, by night he improved the Multiple Explosive Tags technique.

While other Uchiha used the Sharingan to read emotions, he used it to calculate chakra fluid dynamics.

His clan called him a "traitor," the Hokage labeled him a "monster," but all he wanted was to survive… and maybe rewrite history along the way.

Even more absurd—

Using Tobirama-style sage arts and Sharingan-based simulations, he forcibly evolved his eyes into a science-based Mangekyō Sharingan!

The night of the massacre? Sorry, now it's Uchiha Eiji's turn to clean house.

Years later, during the Fourth Great Ninja War.

Tobirama Senju, freshly reanimated by Edo Tensei, opened his eyes to see a white-haired, red-eyed Uchiha brat:

—Flying Thunder God kunai in his left hand, an improved version of the Rasenshuriken in his right,
standing atop a composite Water Style: Water Dragon + Lightning Style formation!

Tobirama's pupils trembled:

"How can this inherently wicked Uchiha… be even more of a menace than I was in my prime?!"

Eiji simply smiled:

"Lord Tobirama, I finished blowing up all the experiments you never got to complete."

(P.S. I'm not Madara Uchiha, but I understand better than him what it means to—overturn the shinobi world with science!)

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