Riko works in real estate and feels stifled by the rigid compliance rules of modern life. After falling asleep while complaining that she wishes she had been born in the more permissive Showa era, she wakes to find her home, office, and everything around her transformed into that period. At work she is overwhelmed by sexual harassment unimaginable today and is pushed into entertaining clients in bed—but little by little, she starts getting hooked on the uninhibited atmosphere.