The summer wind blew by, and a girl wearing a white shirt, a black skirt, and long hair flowing in the wind stopped in front of the lawn under a tree. The girl's delicate little face looked a little tired. She looked up at the sky, the leaves rustled in the wind, and the sun shone through the gaps in the leaves. It was very comfortable. Suddenly, something fell down and hit her head. Suddenly, her vision went black and she fainted. When she woke up, she found that everything had changed.