Glasses. Ends sentences with "-yansu." First person: I (Oira). Fairly pushy but kind. A member of the Powerful High baseball club. A fast-footed outfielder, but a total klutz who can't catch the ball even when he reaches the drop point. Same grade as the protagonist. Was in the same Junior Little League as Mamoru.

The protagonist's father. Wears a white towel wrapped around his head. Loves baseball intensely; he was apparently a legendary high school player and taught the protagonist everything. Frequently spouts words of wisdom (and nonsense) from his years of experience. Can be blunt with his son, but genuinely loves him. Prefers L-Chiki chicken. Smoker. Carpenter.

The 3rd-year captain. Harbors a strong rivalry toward Akatsuki University Affiliated High. Skilled at baseball with plenty of grit, passion, and charisma. Dreams of going to Koshien. Has a partner named Yoshino, a fellow 3rd-year and the team's ace pitcher.

Considers himself a "cute junior" and is close with the protagonist. Always grinning, but a reliable, good guy. A pitcher who specializes in the "pitch to contact" strategy.

A super-talented pitcher in the same grade as the protagonist. The ace of Akatsuki University Affiliated High. A total genius. High pride; looks down on the protagonist's team, other schools, and even his own teammates. Has a younger brother named Susumu. Was in the same Junior Little League as Yabe.

Captain of Renren High School. Position: Catcher. Resembles the protagonist, but has the opposite personality—deeply compassionate, hot-blooded, and dignified. Led a petition drive to allow Aoi, a female player who was originally ineligible, to compete at Koshien.

A 1st-year at Powerful High. A fast-footed first baseman. Speaks with a "-ssu" register. Considers himself to have a weak presence. His family is poor and opposes him playing baseball, so he works multiple part-time jobs to earn money for his gear. Fast because he's been delivering newspapers since middle school.

Manager of the Powerful High baseball club. The protagonist's childhood friend, but she moved away when they were young. Because she was his only friend, the protagonist was so lonely and shocked that he repressed his memories of her. She has liked him for a long time. A normal, cute girl. The main heroine of this story.

Catcher for the Akatsuki University Affiliated High baseball club. Mamoru's younger brother. Unlike Mamoru, he isn't a natural genius but a hard worker. Has the exact opposite personality of Mamoru—kind-hearted and loves his family.

The ace pitcher of Renren High School. Though she is a girl, she was able to participate in the tournament thanks to Konami and the others. Despite the physical and athletic differences between men and women, she works hard every day with the mindset of "I don't want to lose just because I'm a girl." Submarine pitcher. First person: I (Boku - soft/boyish).