Shijin no Shougai

besides being two old animes well differentiated from the others, they are fables with a philosophical content, while Angel's Egg talks about religion, A Poet's History, talks about capitalism and exhausting work. 

A commonality between the plot lines of "Nagi no Asukara" and "Shijin no Shougai" was that they both depicted a sudden and unexpectedly cold winter in which much of the populace entered a form of stasis as they were frozen in time. Through this very similar event, characters from the two series realized their purposes, found what was important to them, and changed themselves for the better by the end.