Angel Beats!, Houkago no Pleiades (TV) Recommendations
-Main character enters into a new world that they never knew existed (Angel Beats: world of those who died and cannot rest peacefully and Houkago: the existence of alien, space, and magic)
-Meet irreplaceable/memorable friends and shows you their pasts, their wish, and why they ended up in the position where they are now
-Both involves having to do a mission/a purpose
-Both the animes romance are very similar to each other
-Basically, both animes are very similar, but Angel Beats is more dramatic and dark. As for Houkago, it's more happy, yet depressing. It's not as deep as Angel Beats, but both are very great.
-If you like Angel