A Japanese girl named Yune finds herself in the streets of late-19th Century Paris, France. She is taken there by a man named Oscar, who owns a metalworks shop in the Galerie du Roy.

Yune would find new companions in Oscar's grandson Claude and many new faces, including Alice, a rich girl who is obsessed with everything Japanese, and her elder sister Camille.

In Yune's stay in Enseignes du Roy, she learns about France as she herself gives an insight about Japanese culture.

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