Okay music; absurd plot (purgatory for teenagers with a school which they still should attend even after death). Story predictably goes nowhere. Students team-up to fight and fight again (while organising music concerts) but nothing comes out of it -- after all they can not die but they can feel pain. What are they fighting for? Whom are they fighting? Is that another student or an "angel" (whatever that might be)? You'll never get a meaningful answer like if scriptwriters could not think of anything that would make much sense.
Many violent "deaths" that are actually game-like respawns.
https://myanimelist.net/anime/6547/Angel_Beats
