Gon, Kurapica, and Leorio arrive at Kukuroo Mountain only to find out that they cannot get close to the Zoldyck family estate. The Zoldyck family owns the mountain and all of the surrounding forest and the entire region is gated shut. There is a guard outpost immediately outside of the gate, but instead of serving as a guard, the man working in there actually cleans up the mess created by the watchdog whenever there are intruders into the grounds. Gon, unwilling to give up on "rescuing" Killua, learns from the gatekeeper that the actual door is the massive stone gate and anyone who enters via that path will not be attacked by the watchdog. Leorio tries to pull and push on the gate, to no avail. The gatekeeper informs them that the gate opens up different amounts of stone slabs based only on the strength of the person; however, the least amount of strength anyone needs to open the smallest portion of the door requires two tons of strength on each side.

Gon and his friends have decided to pass through the Trial Gate to see Killua. First, they must train in the servants' residence until they can open the gate. Meanwhile, Killua has learned that Gon and the others are here to see him. Gon, Leorio, and Kurapika are able to open the gate after completing their training, but the apprentice butler Canary stands in their way.

With help from Canary, who is concerned about Killua, Gon and his friends are getting closer to the mansion. However, Kikyo tells them that Killua cannot see them as he is in solitary confinement. Meanwhile, Killua has been summoned by Silva and asked if he wants to see his friend? Killua answers truthfully, and he is allowed to go see his friends...

A letter from Gon arrives at Whale Island for Mito... (A recap of everything that has happened.)