The comedy here operates on pure structural insanity. Every joke is built on the collision between Itoshiki's apocalyptic monologues and his students' bizarre normalcy, each one a walking contradiction that makes the premise funnier the more you think about it. The show weaponizes wordplay and visual gags so densely that you'll miss half of them on the first watch, then spend rewatches hunting for what you lost. It knows comedy timing is negotiable when the joke itself is the breakdown of logic. This is for people who want their laughs to require active participation, not passive consumption.
Nozomu Itoshiki, a teacher consumed by pessimism and despair, returns in this three-episode OVA that picks up where Zoku Sayonara Zetsubou Sensei left off. It brings more stories about him and his pupils in class 2-H, nearly all of whom are strange in their own particular ways. The one exception is a fairly ordinary girl who cannot stand being described as normal. The comedy comes from how this odd group bounces off their gloomy teacher.