ones of the things this series shows is that we've fallen so far as a civilization that when we see existentialism expressed in a childlike way by a couple of girls, instead of realizing "oh, if you depict it so straightforwardly, of course i can see now that existentialism is retarded," we think, "wow those girls really get it, they're so much wiser than all my ancestors"
existentialism is basically "my feelings feel more important to me than philosophy, logic, science, and any law, so let's clear all those away." if daddy issues were a philosophy.
there's more to this manga than that,and this chapter's not the most egregious example anyway, but it prompted the thought