Mucc is a Japanese visual kei rock band, formed in Ibaraki Prefecture in 1997. The classic line up of Tatsuro on vocals, Miya on guitar, Yukke on bass, and Satochi on drums was solidified in 1999 following the departure of original bassist Hiro. After 24 years, Satochi retired from the music industry in October 2021, leaving Mucc a trio. They have released 16 studio albums, with 2020's Aku being their highest-charting. Although predominately a heavy band both lyrically and musically, Mucc is known for switching between music genres and styles frequently. Kerrang! included their fourth studio album Kuchiki no Tō (2004) on a list of 13 essential Japanese rock and metal albums.

Visual kei , abbreviated v-kei , is a category of Japanese musicians that have a strong focus on extravagant stage costumes that originated in Japan during the early 1980s. Koji Dejima of Bounce wrote that visual kei is not a specific sound, but rather it "revolves around the creation of a band's unique worldview and/or stylistic beauty through visual expressions in the form of makeup and fashion". While visual kei bands can be of any music genre, it is generally associated with glam rock, punk rock, and heavy metal.