Hunter x Hunter: The Last Mission

Isaac Netero, the chairman of the Hunter Association, once sealed away Jed, a Hunter who had mastered On, a dangerous form of Nen known as the dark "shadow." Years later, users of On have resurfaced during the "Battle Olympia" tournament at Heaven's Arena, posing a new threat. Netero sees this as his final mission to defend the Hunter Association and the world from this danger fueled by hatred and revenge, and he must gather all the support he can to confront it successfully.