TV-Series
Description
Tôma Tachibana's biological mother, Naoko Tachibana, died when he was three. Naoko was reportedly the ace pitcher of her softball team and a national tournament runner-up. His father, Eisuke Tachibana, remarried Mayumi Sawai when Tôma was six. This marriage introduced Mayumi's children, Souichirou and Otomi, making Souichirou his step-brother and Otomi his step-sister. Tôma and Souichirou share the exact same birthday, with Tôma born ten minutes later.

Tôma developed an outgoing and confident personality. This helped Otomi overcome the shyness and fear of strangers she developed after her biological father, Keiichi Sawai's, death. His companionship provided Otomi significant emotional support, leading to an exceptionally close bond. Otomi relied on him as much as or more than Souichirou, preparing "special" versions of food exclusively for him and serving as his unwavering first fan during baseball. Tôma performs at his best when Otomi is present but dislikes her using the childhood nickname "Tou-chan" for him. Observers, including Souichirou, note this unique bond.

Baseball became central to Tôma early on. He engaged in continuous competition with Souichirou to determine who would become the pitcher, the other becoming catcher. Tôma won this role via rock-paper-scissors, and his phenomenal pitching speed solidified his position. During middle school, the coach preferentially favored a less talented pitcher, Daisuke Nikaidou, preventing Tôma from becoming ace initially. After this resolved, Tôma secured the ace position in his final middle school year and continued as the named ace pitcher upon entering Meisei High School.

At Meisei High, Tôma's pitching became integral to the team. His connection to the school's baseball legacy deepened through his father, Eisuke, who was a secondary pitcher for Meisei decades earlier alongside Keiichi Sawai (Otomi and Souichirou's biological father) and Gorou Ohyama (later Meisei's coach). This historical context added layers to his motivation. His pitching style and presence on the mound drew visual and thematic parallels to Tatsuya Uesugi, the pitcher from Meisei's historic Koshien championship win thirty years prior.

Tôma shares a crucial battery partnership with Souichirou, his catcher. Souichirou explained his choice not to pitch by stating, "Touma has Souichirou Tachibana when he pitches but he [Souichirou] isn't there when I throw," highlighting their interdependence. Tôma also shares a childhood connection with Haruka Ohyama, daughter of coach Gorou Ohyama. They first met at his mother's funeral when both were three. Haruka retains fond memories of this interaction, though Tôma has no recollection.

Tôma's development remains tied to his athletic growth, familial bonds, and the collective goal of leading Meisei back to the National High School Baseball Championship (Koshien). His journey reflects personal resilience and the enduring influence of Meisei's baseball heritage.