Sayonara Zetsubou Sensei is a satirical dark comedy anime that explores the absurdities of modern society through the eyes of Nozomu Itoshiki, a pessimistic high school teacher. His extreme negativity and often suicidal tendencies are humorously contrasted with his students' diverse and eccentric personalities. The series cleverly critiques social norms, media, and politics, all while maintaining a unique art style and witty dialogue.