Otonashi awakens only to learn he is dead. A rifle-toting girl named Yuri explains that they
are in the afterlife, and Otonashi realizes the only thing he can remember about himself is his
name. Yuri tells him that she leads the Shinda Sekai Sensen (Afterlife Battlefront) and
wages war against a girl named Tenshi. Unable to believe Yuri’s claims that Tenshi is evil,
Otonashi attempts to speak with her, but the encounter doesn’t go as he intended.
Otonashi decides to join the SSS and battle Tenshi, but he finds himself oddly
drawn to her. While trying to regain his memories and understand Tenshi,
he gradually unravels the mysteries of the afterlife.