In what year was the album “The Varia Songs” released by Katekyo Hitman Reborn?

In what year was the album “The Varia Songs” released by Katekyo Hitman Reborn?: The album “The Varia Songs” was released in 2008 by Katekyo Hitman Reborn, featuring 4 tracks.
What is the most successful song from the album “The Varia Songs” by Katekyo Hitman Reborn?: “Arashi no ouji (Belphegor)” is the biggest hit from the album “The Varia Songs” by Katekyo Hitman Reborn.

Other artists of J-Pop/J-Rock