Starting From Being Adopted by the Second Hokage!

[No system, no brainless plot, no female lead, slightly dark, Uchiha-focused, pure Naruto-style story]

[Reminder: The protagonist becomes stronger through a gradual process — this is not a brainless power fantasy.]

After transmigrating into the Naruto world, he became an unwanted child of the Uchiha clan, and was unexpectedly picked up and raised by the Second Hokage.

Experiments.

A laboratory.

In the dim room, the Second Hokage looked at the child in the container and said with interest:

“An Uchiha... such a perfect experimental subject!”

...

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Check out my other fanfics as well, I have quite a few, some even better (in my opinion)!