Mamiko Noto
Multiple music CDs have been released for "Kyō no Go no Ni". The first was a maxi single entitled on March 23, 2006 by Avex Tracks under the catalog number AVCA-22708. The single contained three version for each "Baby Love" and "Yakusoku": two versions sung by the two sets of voice actors for Chika Koizumi, Kazumi Aihara, and Yūki Asano (Mai Kadowaki, Mamiko Noto, and Mikako Takahashi, followed by the respective members of Sweet Kiss) and an instrumental version. A maxi single entitled "Nisemono" was released on November 5, 2008 by King Records under the catalog number KICM-3175. This single contained "Nisemono" and "Secret Base (Kimi ga Kureta Mono)" in original and instrumental versions as sung by the group, Friends. A studio album of twelve tracks was released on January 7, 2009, entitled "Best Friends", by King Records under the catalog number KICA-950. It included all six of the theme songs as sung by the group, Friends: "Nisemono", "Secret Base (Kimi ga Kureta Mono)", "Daibakuhatsu No.1", "Natsu Matsuri", "Yūyake Iro", and "Negai."