This article, Kazuya Eisei, is an article only to be used by , feared throughout the Five Great Shinobi Countries as the , is the son of Nagato and Keiko Eisei and anti-hero of the series, driven by the cruelty and reality of the world. Once the apprentice of Madara Uchiha's grandson Draco Uchiha, Kazuya now leads Kurogakure as the alongside his childhood friends Kaiser Enrai and Lumina Seiko. However, after a skirmish with his mother's "killer", Danzō Shimura, his hidden powers of the Eisei Clan awakened, transforming him into a demon lord, making his future among humanity uncertain.