In Haruki Murakami's "Sputnik Sweetheart," the protagonist, Sumire, experiences the exhilarating sensation of love for the first time at the age of twenty-two. This moment marks a significant turning point in her life, as she navigates her emotions and affections in a way she has never done before. Her newfound feelings reflect the intensity and complexity of first love, encapsulating the wonder and confusion that often accompany such experiences.

As the story unfolds, Sumire's romance begins to shape her identity and perspective on life. The narrative explores themes of longing, connection, and the challenges of understanding oneself in the context of love. Murakami delves into the intricacies of relationships, illustrating how love can profoundly impact an individual's journey and self-discovery.