Hunter x Hunter Vol. 23 (manga)

6: Part 1 Killua is under attack!! Confronted with a sniper that's shooting Flea-Bullets from afar, Killua must predict where the next shot will hit or fall victim to the fleas that are draining all his blood. But there are more surprises in store as other snipers aim to take a shot at him. Being a human dartboard was not on today's to-do list! Meanwhile, Gon's silent stalker finally reveals himself...with a proposition Gon never expected!