The story follows a teenager that died after waking in the courtyard of a huge school and not remembering anything about his life except his name. On waking next to it a girl named Yuri, who invites him to join the Shinda Sekai Sensen (SSS) or the Front Lines Against the Sky, an organization she founded and runs counter to God and finds a logical solution to their illogical and existence in this world. The opening theme is "My Soul, Your Beats!" sung by Lia and the ending theme is "Brave Song" sung by Aoi Tada.
This world is made up of a typical public school with great sports facilities, in addition, here people cannot die, if they do just revive. SSS members with memories of life have as their single enemy in the school council President Tenshi (Angel), a being with supernatural powers that is responsible for maintaining order in school.