 If you liked
Jigoku Sensei Nube
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 ...then you might like
Hokenshitsu no Shinigami
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In both we have a sensei (one a homeroom teacher and the other a school nurse) who protects his students from supernatural harm using a similar supernatural ability. Also, to obtain said ability, they both had to sacrifice their body in a way.
Both are shounens about a school sensei who exorcises demons that harass his students.
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