The 15-year-old high school girl Oomiya Shinobu may look like a classically Japanese girl with raven black hair and sweet eyes, but when she was a junior high school student, she actually went to stay with a host family in the UK. She misses her time abroad and one day a letter arrives for her by airmail. As it turns out, her beloved British friend Alice Cartelet will be staying and studying with her in Japan. And so, even though the girls may be from different cultures, they continue to spend exciting days together with their friends.

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Prequel: Kin'iro Mosaic
Sequel: Kin'iro Mosaic: Pretty Days