Asahi Azumane regains his confidence in the series by receiving encouragement and support from his teammates, particularly from his captain, Daichi Sawamura, and the team's coach, Ukai. They help him overcome his self-doubt and fears, reminding him of his strengths and the importance of believing in himself. Asahi also gains confidence through his own determination and hard work, continuously pushing himself to improve and contribute to the team's success.