Hunter x Hunter Movie 2: The Last Mission

Nen: the hidden source of energy and potential that runs through everyone, and gives those that master it a source of great power. Inside Nen is the potential for limitless light and limitless darkness. The Hunter Association has arisen to control access to it. Hunters come in many shapes and forms, and with many different appetites - but all of them have learned to master Nen, and use it to chase wealth, power, and their dreams.
The greatest and most powerful Hunter is Isaac Netero, chairman of the Hunter Association. Decades ago he sealed away Jed, a Hunter who had mastered the use of On, the dark "shadow" of Nen. Now On users have reappeared at the Heaven's Arena "Battle Olympia" tournament. For Netero, this is the last mission: to protect the Association and the world from a threat driven by hatred and the thirst for revenge. And he's going to need all the help he can get in order to succeed.

Hunter x Hunter (2011)

Hunter x Hunter is set in a world where Hunters exist to perform all manner of dangerous tasks like capturing criminals and bravely searching for lost treasures in uncharted territories. Twelve-year-old Gon Freecss is determined to become the best Hunter possible in hopes of finding his father, who was a Hunter himself and had long ago abandoned his young son. However, Gon soon realizes the path to achieving his goals is far more challenging than he could have ever imagined.

Along the way to becoming an official Hunter, Gon befriends the lively doctor-in-training Leorio, vengeful Kurapika, and rebellious ex-assassin Killua. To attain their own goals and desires, together the four of them take the Hunter Exam, notorious for its low success rate and high probability of death. Throughout their journey, Gon and his friends embark on an adventure that puts them through many hardships and struggles. They will meet a plethora of monsters, creatures, and characters—all while learning what being a Hunter truly means.

(Source: MAL Rewrite)

Hunter x Hunter Movie 2: The Last Mission Franchise