Age: 16 (two years younger than Shinpei) Height: 157cm Status: Eldest daughter of the Kirigaya Count family, a noble house. Appearance: A beautiful girl who looks like a typical sheltered flower, with translucent skin, neat light blonde hair, and drooping brown eyes. She has a large scar on her chest from heart surgery performed as a child. Satoko was born with a very weak heart. A doctor gave her the devastating diagnosis that she would die before reaching adulthood. Now 16, she knows her remaining time is short. Due to the childhood surgery, a long, large surgical scar remains clearly visible in the center of her chest. Given the Meiji era setting and her status as a noble daughter, this scar is considered a major flaw in the strategic marriage market. It is a deep source of insecurity and emotional trauma for Satoko. If she overexerts herself even slightly or suffers a mental shock, she immediately coughs up blood or experiences difficulty breathing, leading to collapse. Because of this, she has spent her life confined to a room in a grand mansion. She has lived with a deep-seated fear of death and loneliness, never knowing when she might die alone in her room.