 The album contains two CDs in LP-sized packaging, respectively titled A-side and B-side.The A-side contains six remixes of the opening theme of Key's debut visual novel "Kanon", "Last regrets", sung by three different artists; Eiko Shimamiya sings the third track, Lia sings the fifth, and Ayana sings the remaining four songs.Three of the tracks were previously featured on other singles and albums released by Key Sounds Label and I've Sound.