Mito reveals her childhood with Ging to Gon while Killua is already asleep. It is revealed her parents died in a car accident, something she told Gon at a younger age that happened to his parents. She tells him that Ging left Whale Island at the same age as Gon to attend the Hunter Exam and after that, he came back 10 years later with Gon. He asked her to take care of Gon and left again, but not before leaving a mysterious box to him. Mito tells Gon that her and Grandmother really don't know anything about his mother, even if he asked. Mito then gives Gon the box. Gon asks to know more about Ging, and Mito explains he was adventurous even at a young age.
The next morning Gon and Killua try to find a way to open the box. Killua tries to open it with his strength, but fails. They try to using Nen and open it. Another box is inside, but by using Gon's Hunter License they finally open the box and find 3 items inside: a ring, a cassette tape, and a ROM card. They get a cassette player and play the tape. On the tape is Ging's voice asking if Gon wants to see him.