Gon Freecss runs into a Foxbear in the forest. A mysterious stranger named Kite saves Gon by killing the beast. This man tells him that his father Ging is alive. Gon decides to take the Hunter Exam and become a professional Hunter, but can only do this after catching the Master of the Swamp to convince his Aunt Mito to let him do it. Despite her feelings, after Gon catches it, Mito allows him to begin his adventure.

Gon, Kurapika and Leorio continue on the test, arriving at a cabin in the woods. A husband and wife say they have been attacked by beasts, when a beast shows up and kidnaps the wife. Leorio stays to treat the husband's wounds as Gon and Kurapika help the wife. In the end it turns out the couple and the beasts are a family and they find the group worthy of continuing to the next test.

Tonpa has placed Leorio and another examinee near hallucinogenic sap. In a dream state, he explains that he wants to be a Hunter to get money so he can become a doctor who doesn't charge for his services. Gon and Killua bond. At the end of the first stage, a man appears to accuse the examiner of being a fake.

The protagonists and others have passed the second stage, and they fly towards the next stage on a blimp. Anita, a girl who failed the earlier test, sneaks aboard to get revenge on Killua for the death of her father. The Hunters capture her, and Chairman Netero offers to free her if Gon and Killua can take a ball from him.

The objective of stage 3 is to get down from a tower alive. The group is forced to team up with Tonpa, and their test is to win 3 out of 5 matches against tower prisoners. Tonpa takes the first match with a hardened-looking criminal, and promptly gives up. He explains that he doesn't want to be a Hunter, he just likes watching others fail and be killed.