Girls Dead Monster is an all-female Japanese pop group formed by marina and LiSA for the anime Angel Beats!. The group is based on the four-girls fictional group of the same name in the anime, voiced by Sawashiro Miyuki, Matsuura Chie, Asumi Kana and Kato Emiri.
Vocalist/Rhythm guitarist, Iwasawa (岩沢) voiced by Miyuki Sawashiro (沢城みゆき), her singing is by the artist Marina - she plays a Sienna Sunburst/Maple Fender Stratocaster guitar.
Vocalist/Rhythm guitarist, Yui (ユイ) is voiced by Eri Kitamura (喜多村 英梨) in the anime. Her singing voice is by the artist LiSA. She plays a Gibson SG Special.
Lead guitarist, Hisako (ひさ子) voiced by Chie Matsuura (松浦チエ) - She plays a Jupiter blue/Rosewood Fender JazzMaster.
Bass guitarist Sekine (関根) is voiced by Emiri Kato (加藤 英美里). She plays a G&L L-2000 bass guitar.
The drummer of the band is Irie (入江) voiced by Kana Asumi (阿澄佳奈).