The single was first announced on September 9, 2015, with Toei crediting the duo for the official theme song of the film.[3] Kaori Mochida and guitarist Ichirō Itō are creating the song for the film, which was currently untitled.[4] In the group's latest blog, the song was revealed as "Kira Kira". The song was then used for the commercials of the film in October 5, 2015[5] while the limited edition version of the single includes a Cure Flora Data Carddass card.
