Kishimoto, Masashi. Naruto, Vol. 6. 2001. 192p. ISBN 9781591167396. Available in the graphic novels section of the library.
Having passed the written portion of the Chunin exam in Naruto, Vol. 5, Naruto and his team have been dispatched to the Forest of Death, where they are entrusted with one of the two scrolls they need to have in their possession before they reach the tower at the center of the forest. Immediately, things go bad as students are attacked and killed. An imposter has infiltrated the proceedings, and is using his abilities to mask his real face. When he confronts Sasuke, Naruto and his rival are quickly put out of commission. Sakura, however, remains in the fight and stands up to this foe. Right at the time of defeat, however, Roc Lee and some of the other students join the fight against the sound ninjas.
The story continues in Naruto, Vol. 7.