Introduced in the Junior High story arc, Yoshitaka Yamane is on the Mifune Junior High School team, but uses it to cut class with some other friends that follow him. He and his friends beat up Komori after he tells them that they have to quit if they aren't going to contribute to the team... and then frighten all the other players into quitting too. When Goro returns and confronts him, Yamane reveals that he hates baseball because he cannot play it anymore. He was injured the year before and cannot throw the ball with his right arm. Goro, who suffered a similar injury, teaches Yamane to throw left-handed and he rejoins the team, playing first base. He goes on to Mifune High School with Komori.

(Source: Wikipedia)