Dare ni mo Natsukanai Tobikyuu Tensai Youjo ga, Ore ni dake Amaete Kuru Riyuu

An eight-year-old girl in the class is a grade-skipping genius with an attractive, doll-like appearance but a distant and unapproachable personality. Initially, it seems she only has a close relationship with her older sister, also a student at the school. After receiving snacks from an average male classmate, she unexpectedly begins showing him unusual affection. She grows increasingly attached, displaying behavior that is tender and exclusive toward him. She goes as far as attempting to have him marry her sister, a highly attractive student at the academy, to make him her stepbrother. The narrative follows the dynamic between this socially isolated young prodigy and the unremarkable boy.