When one mentions Yuki Kajiura, then I'll have mention His Excellency, Revo. No, not talking about his mini project Linked Horizon (When will SnK die?).
Anyway, just browse through Sound Horizon. And Yuki Kajiura x Revo collab, Dream Port is also good.
PS: They're not from anime but you can just imagine the story just by listening to the album. Don't worry, all interpretations are valid 🤣
PPS: In case you do decide to listen to them. I suggest you listen to their past album before listening to Nein album because... they're related.