In addition to being the theme song of Misia's Hoshizora no Live V Just Ballade tour, "Ginga" was also chosen as the official image song for the International Year of Astronomy and its music video, which features the position, size and distance data of stars and other celestial bodies, presented in 4-D, was created in collaboration with the National Astronomical Observatory of Japan.
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In an interview with The Japan Times, Misia revealed that the inspiration behind "Ginga" was her late grandfather.
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Both A-sides were featured in commercials for Kose cosmetics Sekkisei Supreme and Sekkisei, respectively, starring Nanako Matsushima.
Many Kai Kens play important roles in the Yoshihiro Takahashi series Ginga: Nagareboshi Gin and its sequel, Ginga Densetsu Weed, including the brothers Kurotora, Chutora, and Akatora.