I probably have a few,but you can find many mangas like that in the psycology secion
http://www.mangago.zone/genre/Yaoi,Psychological/?f=1&o=1&e=Romance
Or also in the tragedy section(my fave) ヾ(☆▽☆)
http://www.mangago.zone/genre/Yaoi,Tragedy/?f=1&o=1&e=Romance
oyasumi bunbun i think
sorry typo its oyasumi punpun (￣∇￣")
ugh that manga is so good, in general the author of oyasumi pun pun has a bunch of other great books, after i finish collecting the series I'm going to buy more
can you please suggest some super sad or depressing manga or anime without any romance in it? thank you so much