Girls Dead Monster

Band from the Japanese anime television series エンジェルビーツ! (Enjeru Bītsu!), or Angel Beats! in English.

It's just another all girl high school band, except the high school is actually a limbo for the souls of dead teenagers, and the band is part of the Afterlife Battlefront (死んだ世界戦線 Shinda Sekai Sensen, (SSS)), an organization which fights against God for the negative experiences the SSS members went through in life.