Naruto: Starting From Orochimaru's Experimental Subject!

[Refreshing article + Naruto fanfic + Krypton life upgrade + leapfrog battle + protagonist’s hexagon + reasonable ability acquisition]
Lin Feng traveled to the world of Naruto, opened his eyes and found himself lying on the operating table on the line of life and death, and was about to face a death battle to raise gu in Orochimaru Sound Ninja Village.
Fortunately, the Krypton Life System has been temporarily activated. You only need to spend your longevity to infuse ninjutsu and scientific knowledge, and you can perform unlimited deductions and obtain results corresponding to the time.
"In the fiftieth year of my life, you improved the parasites of the Aburame clan. From then on, the parasites can absorb the chakra of the tailed beasts for your use, becoming the pseudo-Ten-Tails Jinchūriki"
"In the three hundred years of my life, you studied Orochimaru's notes, perfectly cultivated the Mangekyō Blood Ring Eye, and opened it "Double Divine Power."
"With five hundred years of life, you have opened the Eight Doors of Dunjia·Death Door, and have overcome all the shortcomings of the Death Door."
"With two thousand years of life, you have mastered the three Immortal Land Immortal Modes and successfully integrated them together.
...