If you liked the Kokumin Quiz manga, the Anime-Planet community thinks you'd like:
The world is never quite the same once we grow up. Villains and robots that once ran rampant in our imaginations are reduced to drawings in Manga, and our lives are distilled until there is little left but the daily grind; so it has been for Kenji. After a childhood of dreams he now runs his late father's liquor store and is raising his sister's child. The memories and friends from his early years bring him some happiness, but they become tainted as a string of murders find connections to his past. Kenji and his friends must now fight to save the future from their past and unravel the mystery of "Friend."
The government goes crazy!
In 20th Century Boys, we see a new political force rising in Japan, a friend who has come to end the terrorism that Japan has had to endure. 20CB follows Japan through its greatest crisis, spanning decades and showing a disturbing and somewhat ridiculous dystopia emerging.
In National quiz we follow the host of the worlds greatest game show; National Quiz! The winner of the quiz gets to make a public decree, that the SS (a japanese special police force) will enact. Want the eifel tower in your backyard? No problem! The problem with a dysfunctional society, however, is that there are always people who want to restore order and sanity. Strange, right?
If you liked the satirical and absurd aspects of 20CB you will find more than you anticipated in NQ, and if you read NQ and thought "gosh, this was quite interesting" then 20CB will stimulate your neurons in ways you never imagined.
Nozomu Itoshiki is a high school teacher who views everything in life in the most negative way possible. Even his name reflects his personality: if the Japanese characters are written horizontally, they spell out 'despair.' One day during one of Nozomu's many suicide attempts an incredibly optimistic young girl named Kafka Fura rushes to save him from hanging on a sakura tree. Nozumu later finds out that Kafka is a student in his new class! In fact Nozomu's new class seems to be made up entirely of strange, troubled individuals who constantly foil his attempts to end his life.
Like the over-the-top characters and social satire of Sayonara Zetsubou Sensei or National Quiz? Try checking out the other.
National Quiz is mostly political satire and has a concrete overarching plot, while SZS will appeal more to "normal" anime fans, with it's high school setting and oodles of references to anime, but both have a similar quirky and biting wit.