Angel Beats!

With no memories and no idea how he got there, Yuzuru Otonashi comes to in a high school — which would be disorienting enough on its own, except a girl with a rifle immediately tells him he's dead and needs to join her war against God. The afterlife, apparently, looks like a school campus, and it's run by a quiet, silver-haired student council president everyone calls Angel. Yuri Nakamura leads the Afterlife Battlefront, a ragtag group of teens who all died feeling cheated by life, and they're not going quietly. They fight Angel, run distraction ops involving a rock band called Girls Dead Monster, and refuse to follow the rules because conforming might erase them from existence entirely. Otonashi gets swept up in all of it while trying to piece together who he even was. This 13-episode original from P.A. Works starts out surprisingly fun — there's genuine comedy and some solid action — but the emotional weight builds steadily as you learn what each character went through before they ended up here. The soundtrack does a lot of heavy lifting too; the in-universe band performances hit harder than they have any right to. If you liked the emotional gut-punches of Clannad or the supernatural school setup of Charlotte, this covers similar ground in a much tighter package. It also shares some of that quiet, melancholic energy with Haibane Renmei, just with more explosions. Fair warning: the ending will probably wreck you.