 If you liked
Tsuiraku JK to Haijin Kyoushi
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 ...then you might like
Homura-sensei wa Tabun Motenai
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Both series are about student-teacher relationship (although in homura-sensei the roles are reversed with the student pursuing the teacher who is against this whole ordeal)
Both contain pessimistic and kinda weird teacher characters who are not taken seriously by their students