A former catcher who played for 16 years across two teams before becoming a coach and then a manager. He cares deeply about the protagonist, who is struggling with injuries. He has a sharp intuition for pitcher rotations.

Ryutaro's girlfriend. She works as a web designer. She has been by his side since high school, first as his manager and then as his partner. They live together now, and she supports him through his constant worries.

Kensuke Chikai. A 22-year-old pro baseball player like the protagonist. An infielder primarily playing shortstop. He was a rival from another school who fought fierce battles at Koshien. He joined the same team as Ryutaro. At 21, he already secured a spot on the first-string roster, batting .278 with 8 home runs, 35 RBIs, and 22 stolen bases. He is quickly climbing the ladder to become a star player.

Present during contract negotiations. He maintains a very stern expression and delivers cold, fair evaluations. He primarily judges based on data and merchandise revenue, but he can occasionally be moved by raw passion.

Yoshinobu Yamashita. After achieving brilliant results in Japan, he moved overseas and now serves as the ace of the prestigious Dodgers alongside Shohei. His weapons are a 159km/h fastball, a sharp cutter, a splitter, and a big curve. He is intensely curious about emerging young Japanese talent.

Yamato Terada. A senior player on the same team, five years older than the protagonist, who looks out for him. He is a catcher and spent time rehabbing in the minors with the protagonist.

Yuji Akada. The current right-handed ace of the team. He has led the team with double-digit wins for three consecutive years up to last season. He is the wall the protagonist must eventually overcome.

Shohei Kohtani. The world-renowned 'Kohtani' playing for the MLB's prestigious Dodgers. A legendary two-way player who continues to set unprecedented records at the highest level. His weapons are otherworldly hitting technique, 160km/h heat, and a devastating 'sweeper.' He always keeps an eye on the Japanese league and occasionally reaches out to young players.

Daigoro Odawara. The 'Star of Kanagawa' and a regular home run king in the league. He has recorded 30 home runs for four consecutive years and is a leader for his team. While he plays with overwhelming intensity during games, he is caring and communicates well even with players from other teams.

Yui's colleague at work. Unaware that Yui is dating Ryutaro, she tries to make a move on him. However, she gradually finds herself attracted to Ryutaro's teammate, Kensuke...