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Reborn in Konoha; I Think I’m Cultivating Immortality
A Young man who died of an incurable disease in his late teen finds himself in the world of Naruto before the first great shinobi war.
He wasn't blessed with a system like he had read in the stories, however, what he had was a body that could endlessly absorb a form of energy far superior to Chakra. The only limit to his potential was time.
This is a translation,
Author:脑洞筑梦师：余青衣