This is the fourth soundtrack album in 13 years since the release of O.S.T. "tre" for the TV broadcast of "ARIA The NATURAL" in 2008. The soundtrack includes the music for "ARIA The BENEDIZIONE" coming to theaters on Dec. 3, 2021 and its predecessor "ARIA The CREPUSCOLO". All tracks are newly recorded. The album also includes two insert songs from "ARIA The CREPUSCOLO". Both "Coccolo -duet-" and "Barcarolle -duet-" have been re-arranged and revived as completely new versions by combining the vocals of Eri Kawai, the singer of Athena, which was left before she passed away, with the newly recorded vocals and orchestra of Ryo Hirohashi, who plays Alice. The cover artwork is an illustration newly drawn of "ARIA".