"Hyena" is the forth major and 12th overall single released by The Gazette. It is their lone single of 2007. This was released in two different versions: a Optical Impression (CD+DVD) edition and a Auditory Impression edition. The CD+DVD edition comes with a DVD of the title song's PV, while the CD only edition comes with the B-side song "Defective Tragedy". "Chizuru" was used as the theme song for the movie Apartment.

Hyena: Optical Impression

Disc one

1. "Hyena"
2. "Chizuru (千鶴; A Thousand Cranes)"

Disc two (DVD)

1. "Hyena Music Clip + Making"

Hyena: Auditory Impression

1. "Hyena"
2. "Chizuru (千鶴; A Thousand Cranes)"
3. "Defective Tragedy"