This section contains content from Angel Beats! Heaven's Door.Girls Dead Monster was founded by Masami Iwasawa and Hisako, who rediscovered music for the first time in the afterlife by pure chance. Both Iwasawa and Hisako had problems related to music during their life (Iwasawa turned to music to escape her parents' constant fighting while Hisako vowed to never play an instrument after the death of a friend), but they eventually decided to embrace their restored passion in music. They eventually began to play music even during school hours, and their music became famous throughout the school.