"Tsubaki iro D-i-s-k" is ArukaP's fourth album. The album cover was illustrated by RikuKanna. The album contains 13 songs, five covers, six original songs, and one instrumental featuring SF-A2 miki, Camui Gackpo, GUMI, Kagamine Len, Kagamine Rin, Megurine Luka, and Hatsune Miku. It was originally released on February 5, 2012 at The Voc@loid M@ster 19. A crossfade for this album can be viewed on Niconico. This album can be purchased here on Amazon.