After their parents' divorce, the younger sister moved away from her mother. Following their mother's death, she begins living with her older brother again. Their room is split in half—one side for the brother, the other for the sister—and their daily lives are filled with unexpected events. The sister has an unusually strong sex drive, while the brother is kind and pure-hearted. Their relationship is a chaotic, laughter-filled coexistence full of surprises.