EPISODE CONTEXT

Arriving after Gon's recovery and initial Nen training at Heavens Arena, episode 31 functions as a critical showcase of what high-level Nen combat actually looks like—raising the stakes for everything Gon and Killua are working toward. The Hisoka vs. Kastro bout deepens the audience's understanding of Nen's tactical possibilities, knowledge that becomes essential as the main characters continue to develop their own abilities. This confrontation also further defines Hisoka as a benchmark opponent, reinforcing the long-term tension between him and Gon that threads through the entire series.