One of them is the hit song "Koyomi no Ue dewa December" by the fictional idol group "Ameyoko Jogakuen Geino Course" (short "AmeJo") that ranked first on the daily rankings of Recochoku and iTunes. Now they have finally revealed who is actually singing the song for the drama --- it's the idol group babyraids.

In the drama, "Koyomi no Ue dewa December" is AmeJo's third single and a million seller that was released in 2009. The protagonist of the morning drama, "Amano Aki" (Nounen Rena), also performs this song as a member of AmeJo's sister group "GMT46". After being released on Recochoku and iTunes, it quickly became a hit in the real world as well.

The voices behind the song have now been revealed to be the idol group babyraids together with voice actress Minase Inori, who portrays AmeJo member "Narita Rina". The lyrics were written by scriptwriter Kudo Kankuro himself, and the composition was handled by Otomo Yoshihide, Sachiko M, Eto Naoko, and Takai Koki.

babyraids debuted in 2012 and are going to release their fourth single "Baby Ambitious" on July 31. They also plan to record "Koyomi no Ue dewa December" again as five members only and release it as their official fifth single on August 21.

Source: eiga.com