Rock in Japan Festival
In the summer of 2017, Flower Flower appeared in various festivals, including at Rock in Japan Festival 2017 and Summer Sonic 2017, leading to speculation that the band would release a second physical single. In a series of concerts in Osaka and Tokyo, the group announced that they would release "Mannequin (マネキン)" on August 2, 2017. In an interview released on the band's website, Yui would state that despite the song's initial composition as a "summer" pop rock song, reflected in the pop-like promotion material, during pre-production and recording the song eventually gravitated towards hard rock. When comparing the single with its B-side, "Drama (ドラマ)," Yui believed that placing a strong, western-like arranged single in "Mannequin" in juxtaposition with the more graceful song "Drama" would provide a nice balance.