Circle is the fourteenth studio album by Japanese Pop band Deen.

Mou Nakanaide's coupling song Future had received new arrangement under title Album Version.

Kouji Yamane's new song of Shangai Rock Star series had been released in this album as well.

Hirohito Furui, ex-member of Japanese pop band Garnet Crow was involved in a Deen album production for the first time after 15 years.

The limited edition includes DVD footage of their live performance Deen Aor Night Cruisin' ~2nd GROOVE~.