Sawamura Eijun is the protagonist of the series. He comes from Nagano Prefecture, where he played baseball at Akagi Junior High. He is a left handed pitcher who was promoted from the second string to the first string as No. 20 for the Summer Tournament, and later on No. 18 at the start of the Fall Tournament. In Act II, he becomes Seidou's ace in his second year by the start of the Summer Regional Tournament.