http://www.mangago.me/read-manga/ame_nimo_mayuwanai/
See the last page (55.) too!
http://www.mangago.me/read-manga/eien_no_aida_ni_miru_yume/
http://www.mangago.me/read-manga/meiou_hades/
http://www.mangago.me/read-manga/pokerface_lee_ki_ha/
http://www.mangago.me/read-manga/wrong_love_chong_zi/
http://www.mangago.me/read-manga/shinju_bl/
http://www.mangago.me/read-manga/mahoroba_no_hibi/
http://www.mangago.me/read-manga/kosha_ura_no_natsu/
http://www.mangago.me/read-manga/nanadome_no_gomenne/
Any heartbreaking oneshots? It can be any genre...