Responses
http://www.mangago.zone/read-manga/konbini_kun/ (used to be bullied in school)
http://www.mangago.zone/read-manga/manazashi_no_hayagane/ (used to be bullied in school)
http://www.mangago.zone/read-manga/abiru_junjou/
http://www.mangago.zone/read-manga/karada_meate_de_warui_ka/ (this one has bullying but not really sad)
http://www.mangago.zone/read-manga/porno_superstar/
(at school and at workplace too)
Caste Heaven
Any yaoi where the uke or seme is bullied at school? It can be shoujo too, but i'd prefer yaoi. The sadder the better, because I'm sick right now and it just sets to my mood.