I've only ever read this once out of accident, and am not really sure if its considered abuse since there's yakuza involved but yeah, its real angst to the point that i wanted to forget but voila, i still remember the title even after all these years :'))
https://www.mangago.zone/read-manga/nigatsu_no_eden/
And then this one i cant even speak of :'))
https://www.mangago.zone/read-manga/timeless_melody/
https://www.mangago.zone/read-manga/this_witch_of_mine/
dude you dont understand i was sobbing like a bitch so hard i couldnt breathe through my nose
https://www.mangago.zone/read-manga/zankyou/ overall manga is so sad but the ending omg
https://www.mangago.zone/read-manga/watashitachi_no_shiawase_na_jikan/ Cried like a fking bitch
https://www.mangago.zone/read-manga/diamond_dust/ cried most chapters not even joking
https://www.mangago.zone/read-manga/dead_flowers_dami_zetson/ This one isn’t like sad sad but it’s really bittersweet
I wanna bawl my eyes out