Akiko Infinity Kokia: Balance (stylised as AKIKO∞KOKIA ～balance～) is Kokia's ninth equal studio album, released simultaneously with Kokia Infinity Akiko: Balance in March 2009.

Two songs from the album feature on Kokia's greatest hits collection Coquillage: The Best Collection II: "Infinity" and "Sekai no Owari ni."

To promote the albums, Kokia embarked on her first world tour, Infinity. The tour, beginning in April in Japan, went for two months, with Kokia visiting Belgium, France, Germany, Ireland and Poland.

When Kokia wrote music throughout her career, she began to notice a division in her song-writing when she wanted to write songs about herself. There was a difference between songs written as "Kokia" (the musician), and "Akiko" (the person herself). Kokia described the simultaneously released album concept as "two different existences that live off of each other."

While Kokia Infinity Akiko is sung as a standard Kokia studio album, Akiko Infinity Kokia deals is sung from the view of "Akiko," the treasured glimpses of her inner self that began coming through in her musical persona.

One song features on both albums, "Infinity," however it is arranged is completely different on both discs. The version on this album was described "tender feelings, as if it were sung for you in front of a fireplace," as opposed to the "magnificently arranged" sound of the Kokia Infinity Akiko version.

The bulk of the album recording took place between December 2008 and early February 2009. Between December 15–17, Kokia recorded five tracks in single takes backed with studio musicians.

While some of the songs on the album were written specifically for it, many of them are older, unpublished songs. On the 6th of January, Kokia replaced three older songs originally intended for the albums with newer tracks she had written.

"Wasuremono" is one of Kokia's oldest songs. It was originally performed in 1998 and 1999 in live concerts for her debut album Songbird. "Ōki na Senaka" was performed at Kokia's special Akiko Yoshiba Hakigatari Live: Piano to Akisuke concert in late 2004. A song from Kokia Infinity Akiko, "Kono Mune no Kurushimi ga Itooshii Hodo ni Ikite," (この胸の苦しみが愛おしいほどに生きて, Living to the Point Where I Love This Pain in My Heart) was also performed at this night.

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Wikipedia