I'm looking for a manga about a teacher who's actually a pedophile pretending to be a norm...

Ff

http://www.mangago.me/read-manga/boku_dake_ga_inai_machi/
I don't know,it may be wrong (￣ε(#￣)Σ

http://www.mangago.me/read-manga/kyoushitsu_no_yugami/

Thanks for the replies, but no, it's another one and he's like the main character (honestly the general idea and character design is very disturbing to me - it came up in conversation and I need it to prove a point, I'm not looking to read it)