Tamaki Kitakōji is Benio Hanamura's closest friend, possessing a traditionally feminine demeanor yet sharing Benio's progressive views on women's independence. Initial romantic feelings for Shinobu Ijuin create emotional tension upon Benio's arranged engagement to him, but Tamaki ultimately chooses friendship over rivalry.

Her story deepens through her relationship with Shingo Onijima, Shinobu's military comrade. After Shingo sustains a youth eye injury protecting someone, Tamaki supports him through trauma and his eventual departure for Manchuria. Choosing to accompany him despite uncertainty, she demonstrates commitment. Her professional identity emerges as an intrepid reporter, mirroring Benio's career and reflecting her embrace of modern womanhood beyond domestic roles.

A pivotal Tanabata festival conversation with Benio reveals Tamaki's perspective on adult responsibilities and sacrifices. She voices nostalgia for youthful freedom alongside life's evolving constraints; Benio counters that even birds need branches to rest upon, symbolizing adaptation. This exchange underscores Tamaki's nuanced understanding of duty versus personal desire.

Her narrative concludes as she departs for Manchuria with Shingo following the 1923 Great Kantō earthquake, amidst the region's historical challenges. Throughout Benio's struggles—Shinobu's presumed death, reappearance, and amnesia—Tamaki remains a steadfast emotional anchor, offering counsel during critical decisions like Benio's self-sacrificing marriage to Tousei Aoe. Her journey embodies loyalty, resilience in love, and quiet determination in pursuing personal and professional fulfillment.