The bond between Hinata and Kageyama in the anime "Haikyuu!" is crucial to their gameplay as they develop a strong connection on and off the volleyball court. Their unique dynamic allows them to understand each other's strengths and weaknesses, leading to better teamwork, coordination, and communication during matches. Hinata and Kageyama's bond also drives them to push each other to improve, inspiring them to work harder and strive for success together. Ultimately, their strong bond enhances their gameplay by creating a powerful and effective partnership that benefits the entire team.