The A&K "Endless Sky" CD was released in Japan on April 9, 2008 by KING RECORDS. This CD was released to go alongside with the live-action TV series, Negima!!
This CD's main feature are the ending themes for the Negima!! series. This CD includes both the first and final ending theme to the series most notably, this is the only CD release to include the song "Endless Sky".
The vocals were performed by A&K, a group comprised of the Negima!! actresses Mihoko Kondo and Sara Wakatsuki, the voices of Kazumi Asakura and Asuna Kagurazaka respectively.
The song, "Endless Sky," was composed by Yuki Kajiura.
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