Hunting X Villains X Heroes (MHA X HXH)

"This job is kind of shady, don't ya think Gon?" "Yeah...Why do we have to hunt down humans this time?" "...I don't know." Gon and Killua are given a job to hunt a villain called All For One. However, they must transfer to Musutafu, specifically, to a school called UA High...will they succeed in their hero classes? Or...