In what year was the album “Kokoro no Tsubomi” released by Surface?

In what year was the album “Kokoro no Tsubomi” released by Surface?: The album “Kokoro no Tsubomi” was released in 2006 by Surface, featuring 4 tracks.
What is the most successful song from the album “Kokoro no Tsubomi” by Surface?: “Kokoro no tsubomi” is the biggest hit from the album “Kokoro no Tsubomi” by Surface.

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