Misaki Haruno is Sakura's sister! Sakura hates her though. Misaki was better at her in everything even though she is 16 months younger. Sakura's hate when she was young (as in like 6 years old) eventually drove Misaki away and now she is back after the 4th Great Shinobi War. Misaki still loves Sakura even though she hated her. Piece by piece their relationship mends together again and a new one forms with Sasuke and Naruto. Maybe even a special relationship with Sasuke but will Sakura hate her again if she figures out?