Like all pictures in this gallery, this is a screenshot of one of the monthly Hunter X Hunter Videos Junko did for AX Animation Magazine.
All 4 people in this picture are seiyuu who played major roles in Hunter X Hunter.
From left to right: Kanako Mitsuhashi (Killua), Yuki Kaida (Kurapica), Junko Takeuchi (Gon), Hozumi Gouda (Leorio).