Natsumi Takahara is the protagonist and central character of Onnanoko Monogatari, a story based on the autobiographical work of manga artist Rieko Saibara, with Natsumi serving as Saibara’s fictionalized alter ego. In the narrative, she is a manga artist in her mid-thirties living alone in Tokyo, struggling through a severe creative slump. At the start of the story, she spends her afternoons drinking beer and napping on the sofa, showing little motivation to work. Her editor’s blunt remark about her lack of friends triggers a deep longing to revisit her childhood, prompting her to return to the small coastal town in Ehime where she grew up after her mother remarried. This journey into her past is the emotional core of the story.

Natsumi’s background is defined by her childhood in a natural, rural setting surrounded by ocean and mountains. There she formed a close bond with two friends, Kimiko (nicknamed Kiichan) and Misa. The three girls shared everyday adventures, dreams, and a sense of belonging, though even as a child Natsumi felt a desire for a world beyond her small town, which sometimes created a subtle distance between her and her friends. Her motivations are rooted in a search for purpose and connection; her initial slump reflects a loss of direction, and the recollection of her friendships becomes the catalyst for rediscovering her own story and what truly matters to her.

Personality-wise, Natsumi is portrayed as introspective, somewhat melancholy, and fiercely independent, yet also vulnerable and capable of deep nostalgia. She is not overtly expressive, but her memories reveal a strong emotional core and a longing for authenticity. As the story progresses, she evolves from a passive, stuck individual into someone who actively confronts her past and accepts the bittersweet truths of her relationships. Her key relationships are with Kimiko and Misa, who represent the unconditional friendship she took for granted. A significant emotional turning point is her discovery that Kimiko has passed away and that Misa has left the town, as well as her encounter with Kimiko’s young daughter, also named Natsumi. This meeting forces her to understand the depth of Kimiko’s feelings for her, ultimately leading her to acknowledge that those childhood bonds were indeed true friendship.

In terms of role within the story, Natsumi is the lens through which the themes of memory, loss, and the passage of time are explored. Her professional identity as a manga artist is notable; she draws and creates as a way of processing her experiences, and her art serves as a bridge between the past and the present. Her notable ability is not a supernatural skill but her capacity to use drawing as a form of emotional expression and self-reflection. The film shows her creating a drawing of the three girls holding a message in a bottle, which becomes a symbolic representation of their separate paths. Through revisiting her hometown and its people, Natsumi reclaims her confidence and rekindles her creative drive, completing her emotional journey from isolation to reconnection.