I will make you all pay (daughter of pein)
Sakura is 19 and has been abused by her parents for as long as she can remember. All her 'friends' except shika, Sai and Hinata all treat her like shit.
One day when sakura is organizing files for Tsunade. She decides to read her file and she learns that she is actually the daughter of Pein and konan.
They loved her but they think that see was murdered at age 7.
Sakura makes it her goal to find her parents and make konaha pay for betraying her, kidnapping her from her family, abusing her, treating her like shit and for all the times they made her feel worthless.
Pein, konan, Tobi ( he is actually madara not obito in this story), zetsu, kisame, itachi, deidara and Sasori (he is human in this story and is like a brother to sakura).