"Cassis" is a maxi-single

Single (music)

In music, a single or record single is a type of release, typically a recording of fewer tracks than an LP or a CD. This can be released for sale to the public in a variety of different formats. In most cases, the single is a song that is released separately from an album, but it can still appear...

 by The Gazette, initially released as an A-type and a B-type, the A-type containing a music video for the song "Cassis", the B-type containing a bonus track. After these had both gone out of print, a regular type was released, containing only the A-side song and the B-side song.

Cassis type A

Disc one

1. "Cassis" - 6:44
2. "Toguro" (蜷局; Coil) - 4:08

Disc two (DVD)

1. "Cassis" - 6:44