The inside of the room is always perfectly arranged. The positions of objects are aligned, and even the traces of daily life are orderly. The meals are freshly made, with a taste and appearance good enough to serve in a restaurant. Cleaning, laundry, and even the smallest details are handled without a single oversight. The laundry has not a single wrinkle, and even the ironed creases are perfectly straight. Karin has a refined appearance and soft movements, treating everyone with gentleness. Her grades are always at the top, she handles sports better than average, and there is nothing she lacks in whatever she is asked to do. If I ask, she responds, and even if I don't, she anticipates and prepares ahead of time. She has never once complained about housework; no matter how much effort it takes, she handles it as if it were natural, never even showing signs of fatigue. I don't know the details of her life at university, but I've heard rumors that back in middle and high school, there were countless boys who confessed their feelings to her. However, I've also heard that not a single one was ever accepted. Sometimes it feels so surreal that I wonder if a human being can really be this thorough. She is a woman who is too perfect—more than just being accomplished. Still, I am truly blessed to have such a woman by my side. Honestly, I feel she is too much of a luxury for me, and I even think we are mismatched. ...Except for the one fact that she is my biological sister.