Individual Emotion is Aya Kamiki's fourth album and her first under her new label Avex Trax, released simultaneously alongside her first greatest hits album . The only single from the album is "W-B-X ~W-Boiled Extreme~", the opening theme song for Kamen Rider W. The first disc, included in the standard and limited edition releases, is a normal studio album. The second disc, only included with the limited edition releases, is a compilation of several non-album B-sides and album only tracks selected by Kamiki's fans.