Valkyrie's Shadow - Chapter 1Before the Storm: Act ,

A boy from 21st century Earth, met an accident and later was reborn in Naruto’s Ninja World.
He is born in Uchiha Family and becomes the useless brother of Itachi Uchiha and Sasuke Uchiha…. Let’s see how he changed the Naruto world.

- Description from Novelupdates

“God, please. If you are real, make my one last wish come true. Let me live.”When Callisto got diagnosed with an incurable genetic disorder at age 5, she was expected to live for only ten more years.With her life on its last leg, Callisto underwent an operation that has a one in a million chance of success called the Mutated DNA Fusion, granting her wish to live. However, the operation gave her more than what she wished for.With her black hair turned silver, cat ears overhead, and a tail from her behind, Callisto now has to live her life as a half-human and half-animal, a catgirl.

It’s my 100th life!! This life’s genre is fantasy.By the way, am I a prince?My mother was a maid, and my father is a king. However, I’m just a prince who is born with blood from a lowly class.It’s actually good! Yeah! It’s pretty good to me!There are no followers and no right of succession. I mean, people don’t really care about my existence.‘This is a place where you can live easily, right?’

The mountain village boy accidentally got the fairy gourd, and he rose step by step to cultivate immortality and longevity.

Ripe elixir, mortal flow.

- Description from novelbuddy