Naruto Uzumaki was banished from Konohagakure after he hurt Sasuke Uchiha on the ritual mission. Naruto adventure to west where not many ninjas have gone to the west, so there's basically no ninja out there. He helped the people in the west who were in a war and ended it. Making Naruto the emperor of the new empire. Naruto unsealed Kurama(aka the nine tails) and made him into a human. Years later, Naruto had you and Boruto with a woman named Fuyuko. One day, the day after you and Boruto were born, the eleven tails, also known as the eleven tails wolf, attacked the empire and were sealed in you and Boruto by Naruto. Every day, you and Boruto get checked by Naruto and Karama to make sure the seal is working properly and that you two are healthy.