Jirō Kashiwagi is the catcher for the Hodokubo High School baseball team. He shares a deep, longstanding friendship with Minami Kawashima and Yuki Miyata, dating back to their early childhood. This childhood bond firmly places Kashiwagi within the core group central to the team's management and interpersonal dynamics. His crucial role as catcher demands direct coordination with the team's pitchers during both games and practices. Beyond his athletic responsibilities, Kashiwagi also contributes moments of levity, providing comic relief within the team environment.