Responses
These all have a certain amount of that theme, though not all as the main theme like that one.
http://www.mangago.zone/read-manga/the_end_of_youth_ai_no_uta/
http://www.mangago.zone/read-manga/silence_akiyama_koito/
http://www.mangago.zone/read-manga/hakidame_to_tsuru/
http://www.mangago.zone/read-manga/itou_san_kuraka_sui/
http://www.mangago.zone/read-manga/thank_you_my_god/
http://www.mangago.zone/read-manga/mic_and_neo/
http://www.mangago.zone/read-manga/sakura_gari/
Yaoi manga where uke is really lonely to the point where he feels like he's going to die alone. Uke's personality should be a little bit gloomy. I'm not looking for a specific title of a story but more on a plot like this kind of story. Thanks!