Angel Beats!, Accel World Recommendations
In both Angel Beats & Accel World the main character is put into another world either by force or by owns free will for a reason.
-Both include alternate world where you fight for survival.
-The male MC in both "Accel World" & "Angel Beats" follows a female leader.
-In Both animes the life is said to be "Unfair".
-The MC in both series helps the other cast members overcome certain problems they face and to move on.