The title track of this single marks Minami Takahashi's first time to hold an unshared choreography center position since 2006's "Sakura no Hanabiratachi".

[2] The B-side track "365 Nichi no Kamihikōki" is a gentle, medium-tempo song.

For the first time since "Chance no Junban", AKB48 did not sell a million copies of a single within the first week after the release, breaking the so-called Million Streak that had started since "Everyday, Kachuusha".

Kuchibiru ni Be My Baby still managed to sell a million copies after several weeks.

"Kuchibiru ni Be My Baby" sold 905.490 copies in 2015, making it the 4th best selling single of the year, according to the Oricon.

The full version (included only in limited editions) lasts for 13 minutes and was published along with the release of Kimi wa Melody (43rd single).

On March 8, 2016 (2016-03-08), A Full version was released on official AKB48 YouTube channel.