Official site:http://www.uta-kata.com/
Information about the anime:http://www.wikipedia.org

On the day before the summer holiday, Ichika Tachibana discovers that the charm attached to her cell phone has somehow wound up inside a mirror in the old school building. A girl named Manatsu Kuroki, inside the mirror, offers to return the charm and phone in exchange for a favor. When Ichika accepts, Manatsu emerges from the mirror, but Ichika finds to her chagrin that the charm's stones' have all taken on different colors. Her indignation soon turns to delight as she is transformed by the charm and given an incredibly moving experience in the skies above Kamakura.

http://rapidshare.com/files/163099859/Uta_Kata_01.avi
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http://rapidshare.com/files/164724827/Uta_Kata_11.avi
http://rapidshare.com/files/164752622/Uta_Kata_12.avi