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One day, Shio returns home to discover that her mother has remarried. Her mother is also embarking on a business trip with her new husband, leaving Shio alone with her new stepsister, Kafka. Shio, being only a day older than Kafka, worries that Kafka might attempt to usurp the role of the elder sister. Meanwhile, Kafka is set on making Shio, who was her first love, fall for her again.

