In Haikyuu!!, the theme of rivalry is portrayed through intense volleyball matches between rival teams, showcasing the competitive spirit and drive of the players to outperform each other. The series beautifully highlights how healthy rivalry can push individuals to grow, improve their skills, and develop strong bonds with both teammates and opponents. Additionally, the show delves into the emotional and psychological aspects of rivalry, highlighting the respect and admiration that can develop between rivals who share a common love for the sport.