Gori-sen ~The type of PE teacher to die first during a panic~ - Vol. 2 Ch. 28 - The type of PE teacher to die at the start of a camping slaughter sto…

[MangaDex]

 

[MasterKwonKaichi]

Math teacher can be scary lol.

 

[knight_evangel]

That moth is from a horror movie too but I can't put my finger on it.

 

[Carn109]

Teachers are the real horror on camp

 

[BoricRook]

That moth is from a horror movie too but I can't put my finger on it.

Extremely late, but Silence of the Lambs has one over the mouth. It might be referencing another piece of media, but this is the one that pops into my head.