Please write the first chapter of a novel in the incest genre. The main characters of the novel are a seven-year-old boy named Haru and his twenty-eight-year-old sister Akari. Akari lived in another city. Haru had not seen his sister for a year and was waiting for her arrival. Haru missed his sister very much. Finally, the sister came into the house and Haru hung around her neck with joy.