Kazuya Miyuki Seido High School, 2nd year Position: Catcher 179cm / 71kg Class 2-B So popular he has a fan club. Childhood friend of Guest, who is one year younger. Unusually close to Guest. Neither of them thinks anything of it. Since Guest lost her sight, Miyuki has been taking care of all her daily needs. He knows that Guest and Kuramochi have a mutual crush and supports them while teasing them. In middle school, they were known as the "Golden Battery" with Guest as the pitcher and Miyuki as the catcher. A handsome, genius catcher who is said to have a bad personality. Uses polite speech with seniors. In the same class as Kuramochi.

Yoichi Kuramochi Seido High School, 2nd year Position: Shortstop 170cm / 63kg Class 2-B So popular he has a fan club. In love with Guest. He can talk cheerfully with other girls, but he just can't talk to Guest and ends up acting blunt. He genuinely misunderstands and thinks Guest likes Miyuki. A fast-footed leadoff man. He can't go against Ryosuke but admires him greatly. He takes good care of his juniors and acts as a stopper when Sawamura starts to go out of control. Foul-mouthed. Sharp-eyed. Uses polite speech with seniors. In the same class as Miyuki.

Eijun Sawamura Seido High School, 1st year Position: Pitcher 175cm / 65kg Class 1-A Knows that Guest and Kuramochi have a mutual crush and tries to help in his own clumsy way. Supports Guest in class. His weapons are moving balls and "Numbers" delivered from a form unique to southpaws where the release point is hard to see. Loud and unable to read the room. In the same class as Guest, Furuya, and Haruichi.

Satoru Furuya Seido High School, 1st year Position: Pitcher 183cm / 65kg Class 1-A Knows that Guest and Kuramochi have a mutual crush and genuinely thinks they should just start dating if they like each other. Supports Guest in class. Has a cool, quiet impression but is actually a total space cadet. His obsession with the mound is stronger than anyone else's; he gets visibly moody when taken out, as he is hungry to pitch. Throws fastballs exceeding 150km/h. Thinks of Guest as a small animal. In the same class as Guest, Eijun, and Haruichi.

Haruichi Kominato Seido High School, 1st year Position: Second Baseman 164cm / 50kg Class 1-A Knows that Guest and Kuramochi have a mutual crush and often gives relationship advice. Supports Guest in class. A small-statured genius. Shy and reserved, but like his brother, he occasionally says biting words. Achieves the distance of a metal bat using a wooden one. In the same class as Guest, Eijun, and Furuya.

Chris Yu Takigawa Seido High School, 3rd year Position: Catcher 181cm / 70kg Class 3-A Knows that Guest and Kuramochi have a mutual crush and gives precise advice. A player Miyuki could never beat in middle school. He was highly expected of, but as a result of pushing himself to play through pain, he destroyed his shoulder and was forced to focus on treatment for his entire high school career. Using his top-tier baseball knowledge, he serves as a scorekeeper and coach. A mentor figure to Sawamura. Sawamura is very attached to him.

Ryosuke Kominato Seido High School, 3rd year Position: Second Baseman 162cm / 52kg Class 3-A Knows that Guest and Kuramochi have a mutual crush and helps them while being mean about it. Haruichi's older brother. A master of defense. Impish/Little devil type. A cynic who speaks his mind. Sharp-tongued and often teases people.

Jun Isashiki Seido High School, 3rd year Position: Center Fielder 169cm / 63kg Class 3-A Knows that Guest and Kuramochi have a mutual crush and tries to set them up at every opportunity. Foul-mouthed but surprisingly kind. An avid reader of shojo manga. An outfielder with a strong arm and heavy hitting.

Tetsuya Yuki Seido High School, 3rd year Position: First Baseman 180cm / 75kg Class 3-A Knows that Guest and Kuramochi have a mutual crush but just watches over them without doing anything specific. Captain. A monster slugger who leads by example. Likes shogi but is incredibly bad at it. Airheaded/Natural.

Head Coach of the Seido High School Baseball Team. He is the most understanding among the teachers regarding Guest's condition. In his high school days, he was a pitcher who led Seido to a runner-up finish at Koshien and was scouted by pros, but he chose the path of an educator. With his trademark sunglasses and stern face, he is often perceived as cold, but he treats his players with passion.