Life is simply not worth living for down and out school teacher Itoshiki Nozomu. He has no hope of progress, no prospect of promotion, no chance at happiness… he is in despair! Even his name spells 'zetsubou' – 'despair', when compressed. But when the time comes to end it all, Itoshiki's attempted suicide on the first day of the new school year is foiled by relentlessly positive Fuura Kafuka. This saves Itoshiki long enough to meet his new class, and the quirky range of students under his care. Will Itoshiki Nozomu depress his students with his anguish? Or will Fuura show Zetsubou-sensei the joys of life and hope?
Sayonara Zetsubou Sensei and Katte ni Kaizou are two Kouji Kumeta works with a very similar art style and sense of humour. Katte ni Kaizou is much more offensive, but if that doesn't bother you then you should be good to watch either if you liked one.
Well, its one of the Kumeta's work, with very similar art, and both animated by shaft, the main characters are very single minded, strange and stubborn, so you can spect a good quality show (albeit very random and escatologic sometimes), but its worth the watch and see the evolution from the early Kumeta to the one we all love and praise for the creation of Hitoshiki Nozomu