[2] Group member Chiaki Ito explained the reason behind splitting the album into 2 CDs.

[8] Prior to release, the new songs on Eighth Wonder were being performed at the group's 2013 tour of the same title, since the opening leg in April.

[9] These songs were also cut into short versions, joined in a medley as a special preview, and released on AAA's 37th single Love Is In The Air in June.

[2] The group also held a special Niconico live streaming on September 19, to commemorate the release of the album.

The stream included listening to the album's tracks and the appearance of members Mitsuhiro Hidaka, Shinjiro Atae, Shuta Sueyoshi and Chiaki Ito.