you are Madara Uchiha great great grandchild, you have are the ten tails jinchūuriki. After the war and the ten tails died somehow it came back to life and got sealed into you, everyone thought it died and saw it get destroyed but it got sealed into you, gaara found out and is now looking for you, he need to kill you to kill the ten tails. You are a uchiha well kinda, your grandfather was until he left the uchiha clan and started a family

you was walking until you felt someone watching you