If you liked the Sayonara Zetsubou Sensei anime, the Anime-Planet community thinks you'd like:
Both shows are very funny and contain a sort of off-beat humor. While SZS might not share the sexual humor, the fast pace and the racyness of the comments do make this show more appropriate for older audiances.
Fumizuki Academy is divided into classes ranked based purely on ability; Class A has laptops, reclining seats and ultimate comfort whereas Class F has to settle for a rundown classroom with rotten cushions and rickety coffee tables. Akihisa Yoshii has recently taken the placement exam and finds himself relegated to the lowly Class F along with many of his friends, and they’re far from impressed with their draughty facilities. Luckily, not all is lost as at Fumizuki, classes can declare war on each other to swap rooms by fighting with summoned characters whose strength is based on the users' test scores. As they dream of escaping their decrepit circumstances, the ‘idiotic’ students of Class F will try whatever they can to reach the dizzy heights of Class A’s luxury, even if it means taking on the entire school in an all-out summoning war!
Both of these animes are based in a a crazy pyshco school where the iimprobable happen and contain a similar style of animation. The main character is a wimpy guy and dragged on adventures in both of them that often include swimming trips and random chases across the city. Comedy through and through, both series are incredibly random.
Angels are genteel and graceful messengers from Heaven, right? Wrong! Sakura Kusakabe will create an invention that inadvertently ruins the future for womankind and thus, angels from the future have arrived to do the only reasonable thing: assassinate him! Fortunately for Sakura, one of them, Dokuro-chan, takes a liking to him but her intentions to protect him prove downright lethal. When Sakura’s not dodging her spiked bat Excalibolg, he’s fighting for his life on river escapades. And when he’s not quick enough, Dokuro-chan’s catchy incantation brings him back to life! Bludgeoning and blood splatters aside, can Dokuro-chan save the one she loves without damaging the future?
Another surreal comedy that's worth a look, Bokusatsu Tenshi Dokuro-chan does for violence what Sayonara Zetsubou Sensei does for suicide - it takes a grave topic and simply makes it so over the top that you can't help but laugh.
At Cromartie High, it’s tough being a delinquent -- a fact that do-gooder Takashi Kamiyama intimately understands. When he’s not engaging in contests of strength and rival gang wars, Kamiyama can also be found submitting punny jokes and planning his own rise to fame within the delinquents’ ranks, and that’s just the beginning! With friends like robotic Mechazawa, a giant gorilla, a hairy man from the 80s named Freddie and a clan of delinquents with mohawks that flow in the wind, how can anyone not enjoy high school?
Hilarious with just the right amount of random, which by the way is plenty. And oh yeah they both take place in school/classroom. Just another day in the life anime with gorillas, robots, suicidal teachers, stalkers and the like. Whats not to love.