Eijun Sawamura is the main protagonist of the anime series 'Diamond no Ace'. He is a passionate and determined high school baseball pitcher known for his unconventional pitching style and strong spirit. Despite his initial lack of refinement, Eijun's enthusiasm and unique skills earn him a place on the prestigious Seidou High School baseball team. Throughout the series, Eijun works tirelessly to improve his technique and become the team's ace. His journey highlights themes of perseverance, friendship, and the pursuit of excellence in competitive sports.