No adventures for Gon

After Gon and Killua part ways following the events where Alluka (or Nanika) heals Gon, they each go on different paths. Gon returns to his aunt Mito, as losing his Nen prevents him from embarking on further dangerous adventures. Despite this, his friends like Bisky, Leorio, Knuckle, Morel, and Palm occasionally visit him. Meanwhile, we wonder about Killua's well-being. How is he doing mentally? Is Alluka alright? How is the Zoldyck family, and has Killua changed during this time? Gon and Killua are still friends like they used to be?