https://www.mangago.me/home/mangalist/3148147/
ive been summoned ><
last seven days — mc’s seemingly perfect as mc puts it childhood best friend unexpectedly turns into an angel suddenly in front of him via a mysterious voice from heaven itself who also declares in 7 days said best friend will be taken away to heaven
thus the boys are trying to figure out how to prevent that, but mc also gradually loses his own senses and decides to "defile” his own best friend and shit hits the fan on the final day when they both fall in love with each other
https://www.mangago.me/read-manga/last_seven_days/
two more recommendations that made me genuinely cry:
https://www.mangago.me/read-manga/lovers_on_the_last_train/
https://www.mangago.me/read-manga/koi_wo_suru_tsumori_wa_nakatta/

any short, romantic, sweet, vanilla kinda yaoi??