
Banana fish

http://www.mangago.zone/read-manga/hana_no_miyako_de/
this one made me cry. it's part of a series but the other 2 stories are happy ones (I'll list them below in case u wana read them too):
http://www.mangago.zone/read-manga/hana_no_mizo_shiru/
http://www.mangago.zone/read-manga/hana_no_migoro_ni/

http://www.mangago.zone/read-manga/kimi_no_yume_o_mite_iru/
http://www.mangago.zone/read-manga/10_years_where_i_loved_you_the_most/ - ongoing
http://www.mangago.zone/read-manga/ashita_shinu/ - oneshot compilations
http://www.mangago.zone/read-manga/hengoku_no_calendula/
http://www.mangago.zone/read-manga/kashikomarimashita_destiny/
http://www.mangago.zone/read-manga/lonely_to_organdy/
im not sure if any of this will satisfy you but it made me sad/cry

http://www.mangago.zone/read-manga/life_senjou_no_bokura/
this one had me pretty close to tears
Looking for any tear-jerker yaoi/shounen-ai... story may end with at least one chara's death...