Sputnik Sweetheart

Main Characters and Their Development

• Sumire — a young woman who dreams of becoming a writer. She struggles with social adaptation and finding her place in the world. She falls in love with Miu, which becomes a source of inspiration and inner conflict for her. As the story unfolds, Sumire faces personal crises and disappears under mysterious circumstances, symbolizing her inner struggle and search for identity.
• K — the narrator and Sumire's close friend. He works as a teacher and has romantic feelings for Sumire, which remain unrequited. K is someone who seeks stability and order, but his feelings for Sumire force him to reconsider his life priorities. Over the course of the story, he sets out to search for Sumire, which becomes a journey of self-discovery for him.
• Miu — a successful businesswoman who becomes the object of Sumire's affection. She is mysterious and reserved, hiding deep emotional trauma from her past. Miu lives in a world where she cannot fully open up, and her relationship with Sumire becomes a catalyst for rethinking her own life. Her story reveals themes of loss and the impossibility of reclaiming the past.