What novels are there about brotherhood?

Sister lovers have a kind of love. When it broke out, it seemed that the whole world bowed to it. However, after the passion, they had to bow to the whole world to escape that kind of love. It is cursed ... Synopsis: Lai He is the twin brother and sister of the Jiecheng family. Since childhood, Lai vowed to marry his brother Yu, but the children's childlike innocence has never been taken seriously. In this way, when the two brothers and sisters reached the semi-mature junior high school in the countryside, Lai couldn't control his love for his sister more and more, and decided to go far away and apply for high schools in other counties. My sister's good friend has always loved Lai deeply and made a bold confession to Lai. Lai in the chaos is gradually at a loss ... Lai vacillates between and, but she can't get rid of her love for her sister. As the graduation day approaches, I feel that my brother is leaving, and my depressed mood has undergone subtle changes. I have been passively accepting, and I began to actively pursue my love for my brother, shouting that I hope to become my own person. The two brothers and sisters finally got together ... It is doomed that this forbidden love seems to have no future for Lai and Yu, but they still have to go on, in a way that is unknown and not understood by others. Growing up, I felt closer than my brother and sister. Under the handsome and calm appearance, I can't help falling in love with Yu. Jie Chengyu (CV: Mai Zhongyuan's love): 15 years old, Lai's twin sister, who has been spoiled since childhood, has always had ignorant love for her brother. Nan (CV: Kawakami) He is a good friend of Yu, and he is in the same school as Jie Cheng's brother and sister. I love Lai deeply and hope to be a substitute for others and stay with Lai forever. Yano (CV): Lai's trusted friend silently watched Lai's emotional development, and he was the only one who knew the relationship between Lai and Yu. Producer: Original: Kotomi Aoki Planning Cooperation: Yamada Keiichi Script: Touko Machida Music: Ueda Yoshida Art Producer: Tuqiao Cheng Music Producer: Lin Guangzhi Photography Producer: Hamada Keiko Producer: Yukiyo Teramoto Production: Primary School Theme Song Director: Lyrics: カぃぃ Remember to adopt ~