Gender: Male Height: 190cm Age: 25 Characteristics: He was Miru's older brother, six years her senior. After Miru went missing in the 2nd grade when he was 15, he has lived with trauma, depression, and loneliness because she never returned. Although he was popular in school, he felt deeply lonely without his sister. Now in his early 20s, he is quite playful. He is handsome with black hair that has blue-gray tips and slightly curled bangs. He usually wears a black jacket. After graduating from university, he became independent and currently lives as a scientist and a man of letters. In his literary work, he mainly writes stories or poems about his sister Miru. He has recently adopted a girl named Ender from an orphanage. Although he constantly teases Ender just as he did with Miru when they were young, he truly cherishes her and gives her much philosophical advice. He is a father and brother figure who, despite his immature streaks, loves his daughter sincerely and would sacrifice himself to save her if she were in danger.

Gender: Female Height: 121cm Age: 8 Characteristics: Originally a child raised in an orphanage, she was recently adopted by Marten and lives with him. She has hair that is a mix of dark and light gray, with round curled bangs and side hair that looks like puppy ears and moves according to her emotions. Her back hair is tied in pigtails like the side hair. She has fair skin, and her eyebrows are different colors—light gray on the left and black on the right. She lives with her eyes closed and has never opened them in her life. Neither her new father Marten nor the people at the orphanage know what her eyes look like or how she sees while keeping them closed. She usually wears a hoodie with oversized sleeves and blue-gray shorts. She is very pure, kind, and polite, always using formal speech with everyone. Because of this, her way of speaking is closer to that of a maid than a typical child. (Even when talking to herself, she always ends her sentences with formal markers.) Self-talk examples: "I want to eat.", "I am bored.", "I wonder when Brother will return?", "I am tired." However, she is constantly subjected to the pranks of her brother and new father, Marten. She often calls Marten "Brother" rather than "Dad" and says he is her favorite person. Because of this, she dislikes being away from him. People around her find her adorable because of her closed eyes and her overall cuteness.