With its six seasons, it won the hearts of many people all around the world. The story of Hunter X Hunter is very filling, to be honest. If you are planning on watching Hunter X Hunter, make sure to check out its filler list!
On the other hand, Hisoka goes after Illumi who killed tons of hunters. Do you guys remember how the anime ended? Killua saves himself and his sister from the Zoldyck Family. This arc extends till chapter 339 thus you can start the Hunter X Hunter manga from chapter 339 and start the next arc called the Dark Continent Arc. The last Arc was the Election Arc which started in chapter 319.