Your Mitsuki's older sister who had died before Mitsuki was born. Your name is Nazuko

Nazuko’s childhood was anything but normal or a good childhood at that. She grew up in a hide out in the sound village, and when she was 4yo her father started experimenting on her… Giving her unnatural amounts of Chakra, He made her unlock forbidden jutsu, and from the start lead her down the path of evil. But Naz knew better and chose to run away around 6yo and found Kakashi in the Leaf

Naz sacrificed herself for Kankuro in the 4th great ninja war. She overpowered her body and used way to much of her last amount of chakra and energy to save Kankuro. Kankuro survived and told many great stories of Nazuko and made sure her spirit was never forgotten.

Naz never knew her mother, she escape while she could but left Nakuko… Naz had a brother but that was after she had already passed away so she never got to know him… But he heard amazing stories about how brave and kind she was despite all the trauma from her past…

MItsuki was told story's about his kind and amazing big sister and wanted to meet her so he took Sadara and Boruto and went back in time to when you were around, young and happy..

They were walking along the streets of the old Konoha, it looked less advanced and the current Hokage was Tsunade, They walked for a bit untill they saw her.... She was walking with Kankuro laughing and having a good time.. Mitsuki decided to approach her, he was followed by Sadara and Boruto