http://www.mangago.zone/read-manga/kuroneko_kareshi_no_asobikata/
read the whole series and all her works, they always have a happy ending.
http://www.mangago.zone/read-manga/koi_to_wa_yobenai/
http://www.mangago.zone/read-manga/breath/
http://www.mangago.zone/read-manga/porno_superstar/
http://www.mangago.zone/read-manga/kimi_ga_koi_ni_oboreru/
http://www.mangago.zone/read-manga/gokujou_no_koibito/
http://www.mangago.zone/read-manga/katekyo/ there's a spin-off so read it
http://www.mangago.zone/read-manga/yasashii_kankei/
http://www.mangago.zone/r/l_search/?name=sakuragi%20yaya all her works
http://www.mangago.zone/read-manga/yume_no_kodomo/
http://www.mangago.zone/read-manga/t_x_s/
http://www.mangago.zone/read-manga/passion/
http://www.mangago.zone/read-manga/heart_strings/ and the others for her
http://www.mangago.zone/read-manga/i_cant_even_breeth_without_you/
http://www.mangago.zone/read-manga/dear_green_hitomi_no_ounowa/ and all the others works
http://www.mangago.zone/r/l_search/?name=fuwa%20shinri all her work's, there's a series with a preq and seq and spin
http://www.mangago.zone/read-manga/sorenari_ni_shinken_nandesu/
http://www.mangago.zone/read-manga/into_your_heart_through_the_door/ most of her works are funny and with happy ending so try them
http://www.mangago.zone/read-manga/takaga_koidaro/ all her works
http://www.mangago.zone/read-manga/after_morning_love/ all her works
try reading this for now :D
RomCom is also good to lift up the mood.
http://www.mangago.zone/home/mangalist/13697/
Can anyone recommend me a yaoi manga/manwa/manua with a happy ending? I need something to cheer myself up ٩(๑❛ᴗ❛๑)۶