The special spinoff manga to Hara's main Kin-iro Mosaic manga launched in May 2020. Kin-iro Mosaic launched in Manga Time Kirara Max in April 2010, and the series ended in March 2020. The manga's 11th and final compiled volume shipped in Japan in April 2020. Yen Press is releasing the manga in English. The original manga's story begins with Shinobu, a 15-year-old, seemingly "pure Japanese" girl who did a homestay in Great Britain. Even after coming back to Japan, she still misses her time overseas. One day, an air mail letter arrives from Alice, the girl in Shinobu's host family in Great Britain. The letter reads, "Shinobu, I'm coming to Japan!" The "Japanese/British girls' light comedy" follows the lives of Shinobu, Alice, and other girls from both Japan and Great Britain.