Naruto: Volume 3 - The Forest of Chakra (2002)

While recuperating from his battle with Zabuza, Kakashi assigns his three students a training regimen to increase their chakra control--climbing trees without using their hands! Naruto wears himself out to get it right, but he discovers that his pain is nothing compared to that of Tazuna's grandson Inari, who watched his father be destroyed by Gato, the vicious tycoon...