If Haikyuu!! focused on a different sport, it might explore the dynamics and challenges of another team-based sport such as basketball, soccer, or rugby. The themes of teamwork, competition, and personal growth could still be central to the story, but with a unique twist depending on the sport chosen. Each sport comes with its own set of rules, strategies, and player positions, so the narrative would likely adapt to highlight the intricacies of the new sport while maintaining the essence of what makes Haikyuu!! so engaging.