Story: "God, if you really exist, please give me the one and only precious girl in the world." Rai and Iku, a brother and sister who were born and raised as fraternal twins. Their childhood, when they swore "Iku is my bride," eventually passed, and the distance between Rai, who was good at everything, and clumsy Iku grew with their growth. Iku was disheartened, thinking that Rai hated her, but Rai had secretly begun to love his sister, Iku... Iku, knowing Rai's feelings, is bewildered but accepts them. What shocking ending awaits the siblings who have committed a taboo!? An original novelization based on the best-selling comic "I'm in Love with My Little Sister," with a total of 6 million copies, and its movie adaptation. There is some aging. Since it is stored by an amateur, it is not perfect, please understand. #I'm in Love with My Little Sister #Ikuyo Hashiguchi