Angel Beats takes place in the afterlife and focuses on Otonashi, a boy who lost his memories of his life after dying. He is enrolled into the afterlife school and meets a girl named Yuri who invites him to join the Afterlife Battlefront — an organization she leads which fights against God. The Battlefront fight against the student council president Angel, a girl with supernatural powers.
Two years ago, Shibuya was ravaged by a biological terrorist attack using the deadly Ua virus. Maria Osawa was saved when her father inoculated her against the virus, but is left with partial amnesia from the shock. She works as a cameraman when she reunites with a girl named Canaan in Shanghai, China. A gifted assassin with synesthesia, she is under orders from an unknown organization for a yet unspecified mission
The story takes place in 2061, 50 years after humanity developed the "Net society" that depended on information networks despite their security issues. To improve security, a new network called Meta Real Network — or "Metal" for short — was developed. People's personal memories are reduced to information and placed within "protected virtual stand-alone organic cyber enclaves" called bubble shells online. The result was a virtual "explosion" of creative freedom as people felt safe enough to explore instincts and desires on Metal that they would not otherwise explore in real life. This "friction" between the Metal's alluring lack of restrictions and rules-bound reality led to trouble and incidents that investigators known as "cyber divers" must handle. Masamichi Haru is one such cyber diver.
