Yojouhan Shinwa Taikei, Jinrui wa Suitai Shimashita Recommendations
Both deal with human nature and doubts in metaphorical way.
Both series' have heavy internal narration by cynical, nameless leads as they try to make sense of the chaos billowing around them. Neither move in a linear timeframe.
Though they're very different in setting, both are seinen comedies with lots of satire.
Other similarities are that they have unusual visual styles, non-linear storytelling, and internal monologues of a lead character whose name remains unknown throughout the show.