"Hatsukoi" was written by Narumi Yamamoto, composed by Chris Meyer, Takumi Tsukada and Grace and arranged by Pochi.

"Fancy Baby" was written by Kanata Okajima, who also composed the song with Jon Hallgren.

"Koi no Boogie Woogie Train" was written by Minako Yoshida, composed by Kanata Okajima, and arranged by Yuta Nakano.

A short version of the music video for the song was revealed on September 9, 2013, on Avex Trax's YouTube channel.

[10] "Fancy Baby" was used as theme song for CX's TV show Mezamashi News during the month of October.