In what setting does Angel Beats! primarily take place?

Who is the main protagonist of Angel Beats! who wakes up with amnesia?

A normal teenager who died and ended up in the afterlife school

An exiled former member of the Afterlife Battlefront (SSS)

A restless spirit sent to obliterate Otonashi

Her mother and his father married after they passed

Not being able to keep the students at school in line

Not being able to thank her heart donor before she passed

Not being able to do active things after being paralyzed

Not being able to tell Otonashi her true feelings for him

Otonashi and Kanade are reincarnated and meet again

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