The Night Before the Second Exam

is episode 398 of the Naruto: Shippūden anime.

Summary
At night in Sunagakure, a masked figure breaks into the Kazekage's office building. Kankurō confronts him, and questions his identity, to which he responds that he seeks to "reform" the Land of Wind. As the rebel makes his escape, Kankurō pursues him. Seemingly cornered, he attempts to commit a suicidal attack, but Temari arrives in the nick of time to save Kankurō. The next morning, Kankurō and Temari alert Gaara that his rebels are stepping up their efforts against him, but the Kazekage is determined to supervise the Chūnin Exams. Elsewhere, the main teams of the Konoha 11 all arrive safely to the Demon Desert checkpoint to secure their qualification, while those that arrive late are eliminated and are instructed to return to their respective villages. During dinnertime, a fight breaks out between the genin after the Konoha shinobi accidentally ruined the food. As Fū arrives and is seemingly hoping to make friends, the other genin leave the cafeteria, much to her dismay. Back in Konohagakure, Kakashi reports to Tsunade of his failure to infiltrate Amegakure, suspecting the state of things after having not met Hanzō in person. Meanwhile, Chōji sneaks out to the building where the jōnin are, hoping to get food. Sakura and Ino follow him, and they are all attacked by a giant scorpion. Fortunately, Fū arrives to their rescue. Arriving to the scene, Gaara is amazed that Fū rescued them despite being from a different village, reminding him of Naruto. The next day, the second phase begins, and, as in the previous Chūnin Exams, half of the teams are given the Earth scroll, while the other half are given the Heaven scroll, meaning each team must obtain both scrolls to pass the exam.