Kana Tsukumo holds a position on the Satogahama High School student council, specifically overseeing athletic clubs. Her duties involve assessing the provisional baseball association's activities to decide their qualification for official club status. During this evaluation period, she displays athletic prowess and baseball skills while observing team practices, though not yet participating as a member.

Once the baseball association achieves official club recognition, she joins the team as a permanent player while continuing her student council responsibilities. She becomes the starting right fielder, wearing jersey number 9, strengthening the roster alongside other new additions.

Kana maintains a reserved and stoic demeanor, rarely showing strong emotions outwardly. Despite this, she proactively supports teammates facing personal difficulties. When Maiko Kurashiki experiences severe family problems causing distress and potential withdrawal from both the team and school, Kana takes direct initiative. She approaches Maiko, encourages her to keep playing baseball, and advises her to smile more, contributing to Maiko's choice to stay.

Her background includes proficiency in baseball fundamentals, though prior experience or personal history outside school activities remains unspecified. Her development focuses on shifting from an evaluative student council role to an active team member, utilizing her athletic capabilities to aid the team's competitive efforts while maintaining her administrative duties.