Naruto: one more uchiha

On the fateful night of the Uchiha Clan massacre, Kazui manages to survive by cunningly and desperately confronting Itachi, using Sasuke as his only leverage. However, upon finding his younger sister’s lifeless body, his grief turns into a vow of vengeance. Consumed by hatred, Kazui embarks on a dark path to grow stronger and one day bring down Itachi.

Synopsis is not my strong suit, please read the story.