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Character:

A high school teacher and the youngest son of the Itoshiki family. He always wears a hakama and kimono abroad, preferring flippant casual western clothing in his hometown. When his name is written horizontally it resembles zetsubo, befitting his extremely negative, paranoid and pessimistic attitude. He often shouts "I'm in despair!" and attempts suicide several times, though rarely with serious intent. Most of the main girls seem to have feelings for him but only because they misunderstand what he said to each of them. His negative personality started blossoming when he was in his first year of high school when he 'accidentally' joined a 'Negative' club.

Source from Wikipeida