Noe Kawashima attends Toho Seika Girls' Academy during Japan's Taisho era, recognized by her peers as the academically brightest student in her class. Her nature is composed, straightforward, and calculative, driving an analytical mindset that assesses situations based strictly on feasibility—like evaluating the baseball team's chances before joining. She possesses brown hair, aubergine-colored eyes, and wears glasses.

She joins the nascent girls' baseball team as one of its earliest members, the third or fourth recruit. Despite limited athletic prowess, she serves as the team's primary strategist and tactician. Her focus lies in meticulously analyzing opponents' weaknesses, devising countermeasures, creating detailed training plans, identifying teammates' areas for improvement, and studying baseball rules to formulate effective gameplay strategies. These contributions significantly elevate the team's overall performance.

This analytical approach sometimes manifests as strictness, exemplified by forbidding teammates like Tomoe Tsukubae from attempting high-risk actions like home runs to prioritize consistent results. This underscores her prioritization of logic over emotion in gameplay decisions. Over time, she evolves to balance her calculative nature with team cohesion, though her focus remains firmly on measurable outcomes and tactical adjustments.

She plays as the team's right fielder, generally maintaining a neutral demeanor punctuated by occasional expressive reactions during critical moments. Hailing from a privileged family background, her character development centers on refining her leadership within the team framework, leveraging intellect to overcome physical limitations and the societal constraints of the era.