音无结弦(神谷浩史 配音)死后来到了死后的世界。醒来后发现在一座学校里,一名叫仲村由里(樱井浩美 配音)的女孩让他加入“无法容忍死掉战线”组织,简称SSS。他们的任务就是要和敌人——神的代表学生会长天使立华奏(花泽香菜 配音)作战。由里是这条战线的领袖,只要反抗天使就能继续存在,消灭天使就能获得世界。还没恢复记忆的音无只好答应加入她们的组织,但是他发现天使刀枪不入,他们都是不会受伤和死亡的。所谓敌人和战斗都是针对天使立华奏一个人的。音无还没恢复记忆,他不清楚这样的行为是不是正当的。真相慢慢被揭穿,年轻的生命们早早夭折,到底是神的恶意玩笑还是另有安排......Upon his death, Yuzuru Otonashi awakens into an afterlife high school where a group of student rebels, lead by Yuri Nakamura, take arms against a dispassionate adversary with supernatural powers whom they call Angel. Calling themselves Shinda Sekai Sensen (a.k.a. Afterlife Battlefront), they're in open rebellion against God for their crappy, unfulfilled and cruelly unfair lives (and against a projected reincarnated future as meager sea life, presumably barnacles or water fleas). Though no one can die since everyone's already dead, killings are nonetheless very painful experiences, with complete recovery to follow. The greatest fear in their struggle to maintain their humanity is obliteration (Angel's goal for them), from which there is no return.