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Angel Beats! takes place in an afterlife high school, which acts as limbo for teenagers who have died and experienced traumas or hardships during their lifetime.

Katsuragi Keima is known on the net as the god of getting the virtual girls, thanks to his popular gal game website 'Fallen God', while in real life he’s known as 'Otamegane' and hates all '3D' girls, believing them inferior to girls of the game world. He is approached by Elsea, a devil from Hell who has heard of his legendary girl-capturing skills, to help her in catching runaway spirits that hide in girls.

It is a comedy about a school that segregates students based on how well they do academically, with the class with the smartest students in class A, the dumbest in class F. The students can compete for each others classrooms by having summoning wars, with the hp of their summoned beings being determined by their scores.