The all-female band already performed "Shōjo S," 10th opening theme song for Bleach, in 2009. SCANDAL also contributed theme songs for Fullmetal Alchemist: Brotherhood and Star Driver Kagayaki no Takuto. Not only did the band work on the soundtrack for the Loups-Garous anime film, but the members also appeared in animated form within the film itself.
Sources: ANN, Anime Anime Japan