Sonar Technique

Kakashi's eyes burned with excitement. He knew his father was a hero of Konoha, a powerful ninja, but as a child, he had never known that a person could be this strong. He was proud of his father's strength, and he was also curious about Orochimaru, who could fight his father to such a standstill. Compared to those who could only witness the might of Kage-level experts after graduating from the Ninja Academy and heading to the battlefield, he was far luckier.