Akane Tachibana is a third-year student at the Advanced Nurturing High School, where she is a member of Class A and serves as the student council secretary. Standing 155 centimeters tall with a birthday on May 6, she has lilac hair and orange eyes. Her personality is defined by deep loyalty and sincerity, particularly in her dedication to student council president Manabu Horikita, whom she often stays close to and supports as an unofficial bodyguard. While she is typically professional and serious about her duties, she can also show a playful or reactive side. She becomes stern or hostile toward those she perceives as disrespectful to Manabu, especially first-year student Kiyotaka Ayanokōji, whose casual attitude she finds infuriating. Her admiration for Manabu gradually reveals itself as romantic affection, though he denies they are dating when asked directly. During a school-wide training camp exam, rival council member Miyabi Nagumo targets her for expulsion, isolating her within a group and making her a scapegoat. Even when left in despair and found crying in secret, she refuses to ask Manabu for help, determined not to burden him. Ultimately, Manabu and the entirety of her class sacrifice a substantial amount of points to save her. After this crisis, her openly hostile attitude toward Ayanokōji softens into guarded curiosity. She possesses strong organizational skills and a fiercely independent streak, often shouldering challenges alone while masking her stress with resolve. After her term as secretary ends and Manabu steps down as president, she continues to remain by his side. She graduates successfully, and as Manabu departs, he shares her contact information with Ayanokōji, suggesting their bond continues beyond school.