"Zero, Xiaoyue has been a gentle and sentimental girl since she was a child. She cannot survive in our world, so she lives a very unhappy life. All I can do is try my best to protect her and give her the world I can give her, but she is unhappy. I thought she would be like this for the rest of her life, but when I met you, I met a person who can The person who gives her the world she wants, Zero, Yue is my most precious sister. As a sister, I can't give her anything. The only thing I can do is to give her a pair of wings, a pair of wings that can fly to the world she wants. Zero, no matter what the outcome is in the future, please promise me, promise me you will take good care of my sister..."