ABCD423, (read as 'A Birthday CD for Niisan'), is the second edition of the free digital album made to celebrate KAITO's 11th anniversary. Being made by fans for fans, the project was started with the works of the participators, both as musicians and as artists.
The album consists of 11 tracks, all published on Youtube between February 14 to February 17, in the following order:
DAY 1 "Folk, fantasy & fairytales": #1, #2, #3;
DAY 2 "With Heavy Hearts": #4, #5, #6;
DAY 3 "Love is (un)kind": #7, #8, #9;
DAY 4 "honesty and truth": #10 and #11.
A crossfade of the album could be heard here.
On February 24, the download link for the album was made available. Morever, the full album could be listened online here.