Anna Curtland teaches English and serves as homeroom instructor for class 2-1 at Tōhō Seika Girls' Academy. Her foreign background reflects Western influences entering Japan during the Taishō era, though her speech lacks a distinct American accent beyond occasional English phrases.

When class representative Yuki Souya formally requests her involvement, Anna becomes coach of the school's nascent girls' baseball team. Her substantial baseball knowledge surprises students who initially underestimated her expertise. Early training sessions prioritize foundational endurance, consisting almost entirely of repetitive running drills that temporarily diminish her popularity among the team.

Her teaching style diverges from conventional strictness. Habits like arriving barely on time and sprinting across school grounds foster a relatable, approachable "friend-like" dynamic with students. This perceived flippancy contributes to her general popularity, as students recognize shared tendencies rather than austere authority.

Collaboration defines her coaching methodology. She works closely with Noe Kawashima, leveraging Noe's analytical skills to identify player weaknesses, devise tailored training regimens, and formulate in-game strategies, enhancing the team's tactical development. Her instruction extends to fundamental mechanics, such as demonstrating pitching techniques to Akiko, though her initial form appears unconventional and potentially ineffective for competitive play.

Narratively, she embodies the era's cultural blending. Her presence underscores themes of Westernization contrasting with Japanese traditions, visible in the school's mixed adoption of sailor uniforms versus kimonos and broader societal shifts regarding gender roles. Her coaching role directly challenges contemporary norms restricting female athletic participation.