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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.

In the year 2022, the Virtual reality Massive Multiplayer Online Role-Playing Game (VRMMORPG) Sword Art Online (SAO) is released. With the Nerve Gear, a VR Helmet that stimulates the user's five senses via their brain, players can experience and control their in-game characters with their minds.

Tomoya is labelled as a delinquent at his school because he is constantly late and skips classes, but he seems to have little care about how others perceive of him. Everything in his life seemed dull and unchanging until one morning he meets Nagisa Furukawa on the road to his school; he finds her muttering to herself to give her more motivation for the school day.

Third-year high school student Koyomi Araragi barely survives a vampire attack, thanks to the help of Meme Oshino, a strange man who lives in an abandoned building. Despite being able to save his humanity, several powers from vampirism remained in his body as side effects.

After the outbreak of the unidentified virus "Lost Christmas" in 2029, Japan has been under the control of a multi-nation organization called GHQ. Ohma Shu is a 17 year old boy who has a psychic power in his right hand.

Kinjirō Sakamachi has gynophobia (fear of women), due to his violent mother and sister. Subaru Konoe is the butler of his classmate, Kanade Suzutsuki, and has to dress as a male due to butlers having to be men.

Rintaro Okabe is a self-proclaimed "mad scientist" who believes that an international scientific organization named SERN is conspiring to reshape the world according to its own interests. He and his friend Itaru Hashida inadvertently create a gadget able to send messages to the past.