Itou Junji Kyoufu Manga Collection - Vol. 5 Ch. 5 - Mannequin Teacher

[MangaDex]

 

[Meduchi]

This one is kind of good I think? It's pretty interesting at least. It isn't as funny as it seems it wants to be, but it has its moments. I love the bit with Souichi and the teacher playing with nails behind trees at school. A bit too long maybe, but it doesn't drag on very much.

 

[SteelField]

Karma bites as hard as nails