In Haikyuu!!, the theme of redemption is explored through various characters who face setbacks, failures, or doubts and work hard to overcome them. One example is Tobio Kageyama, who starts off as a talented but arrogant setter. Throughout the series, he learns to work with his teammates, improve his attitude, and earn their trust, ultimately redeeming himself as a valuable member of the team. Another example is Yu Nishinoya, who faces self-doubt after a failed receive, but through hard work and determination, he redeems himself by making crucial saves in important matches. Overall, Haikyuu!! shows that redemption is possible through growth, teamwork, and perseverance.