In what year was the album “HEART” released by L'Arc~en~Ciel?

In what year was the album “HEART” released by L'Arc~en~Ciel?: The album “HEART” was released in 1998 by L'Arc~en~Ciel, featuring 10 tracks.
What is the most successful song from the album “HEART” by L'Arc~en~Ciel?: “Niji” is the biggest hit from the album “HEART” by L'Arc~en~Ciel.

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