Gyūki (牛鬼, Gyūki), more commonly known as the Eight-Tails (八尾, Hachibi), is one of the nine tailed beasts. It has been in the possession of Kumogakure for decades, where it has been sealed into many jinchūriki. Gyūki and the tailed beasts first came into being in the waning days of Hagoromo Ōtsutsuki, who used his Creation of All Things Technique to divide the Ten-Tails' chakra into nine separate bodies and giving each a name.
Naruto is a Japanese manga series written and illustrated by Masashi Kishimoto. It tells the story of Naruto Uzumaki, an adolescent ninja who searches for recognition from his peers and the village and also dreams of becoming the Hokage, the leader of his village.