Ren Mihashi is the primary protagonist and the team's pitcher. His nervousness and extreme lack of self-confidence is at odds with his skill, a result of his passion for and dedication to pitching. Mihashi was ostracized by his middle school teammates, who believed he had been given his position of ace because his grandfather owns the school. During the time period, the catcher and team refused to cooperate during games, causing them to lose every game. Mihashi transfers to Nishiura High School afterward, where he joins their baseball team, though fears he will cause more losses. As the series progresses, Mihashi slowly gains more confidence in himself and trust in the team, especially the catcher, Abe. Despite this, Mihashi retains his skittish and shy personality. He shows to have cynophobia. Mihashi's voice actor is Tsubasa Yonaga, while Sean Michael Teague provides his voice in English.