So... is Sayonara Zetsubou Sensei finished or not?
NO, it is not finished.
Why?
The anime finished before the manga:
Anime finished: February 17, 2010
Manga finished: June 13, 2012
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
Here you have all the anime relations we detected ordered by release date, so you can see the reason for this status in context and also use it as watching order.
The mangas and the non-core contents are excluded by default, but you can enable them by clicking the buttons below:
Sayonara Zetsubou Sensei
さよなら絶望先生
Anime - Base
Release date: July 08, 2007
Zoku Sayonara Zetsubou Sensei
俗・さよなら絶望先生
Anime - Sequel
Release date: January 06, 2008
Goku Sayonara Zetsubou Sensei
Goodbye Mr. Despair OAD
Anime - Sequel
Release date: October 17, 2008
Zan Sayonara Zetsubou Sensei
懺・さよなら絶望先生
Anime - Sequel
Release date: July 05, 2009
Zan Sayonara Zetsubou Sensei Bangaichi
懺さよなら絶望先生 番外地
Anime - Sequel
Release date: November 17, 2009
Synopsis
Sayonara Zetsubou Sensei centers around Nozomu Itoshiki, a profoundly pessimistic high school teacher who finds despair in everything.
The anime follows Nozomu's daily life and interactions with his class, which is filled with a collection of incredibly quirky and unusual female students.
Each episode explores different aspects of Japanese culture and society through a comedic and satirical lens, highlighting the students' unique eccentricities and Nozomu's constant struggle with despair.
It's a slice-of-life comedy focusing on the absurd and often dark humor arising from Nozomu's interactions with his students and his generally pessimistic outlook on life.