"Raisning a bat" is actually good in this pretext but it becomes so sappy at times that I feel like bashing my head. I won't say it's unrequited, it's more like they're both oblivious to it and can't say it out loud.
it sooo unrequited case :
http://www.mangago.me/read-manga/kyuuso_ha_cheese_no_yume_omiru/
http://www.mangago.me/read-manga/koisuru_boukun/
mutual but he thinks it's unrequited and it's hurt :
http://www.mangago.me/read-manga/raising_a_bat/
http://www.mangago.me/read-manga/pokerface_lee_ki_ha/
http://www.mangago.me/read-manga/love_letter_sakai_kunie/
http://www.mangago.me/read-manga/higouhou_junai/
http://www.mangago.me/read-manga/playboy_amour/
http://www.mangago.me/read-manga/desire/
http://www.mangago.me/read-manga/seto_no_omise_no_okyakusama/
http://www.mangago.me/read-manga/croquis/
http://www.mangago.me/read-manga/yuigon/
Yaoi manga with the sort of unrequited love that makes you something in your heart feel dead? :3