Gon and Killua are diligently studying the mysterious ways of Nen with Master Wing at Heavens Arena. When Gon successfully completes the Nen lesson, he also passes the final (and secret) test of the Hunter Exam. After another run-in with the insane magician Hisoka, Gon heads home and receives an unexpected message from his father: Come find me…
— Description from Comic Vine community (comicvine.gamespot.com).
