About 130 years ago, humanity was split in two groups: Those who are awake at daytime, from about 8 am to 10 pm, and those who are awake at nighttime, from about 8 pm to 10 am. Young Sonya, nightshifter, is incorporating the nighttime in her biggest hobby and project at school - designing and sewing clothes. When a new classmate, young Steven, former dayshifter, is introduced, he sparks her interest. How much of one's shift is actually part of one's own identity?