i need to feel something

sleeping dead if you still want to feel some catharsis by the end

sura’s lover if you want undiluted tragedy

10 years where I loved you the most
https://www.mangago.me/read-manga/10_years_where_i_loved_you_the_most/

Azami
https://www.mangago.me/read-manga/azami/

Acid Town (my heart breaks even thinking of it)
https://www.mangago.me/read-manga/acid_town/

The correct answer would be Faraway Home but you've probably read it already.
Other suggestions: "Death Delayed" & "Vampire Beru and Ghost Aki" surprisingly tear jerkers for me. They are more bitter sweet, once u start reading u can't stop crying type stories tho:

https://www.mangago.me/read-manga/death_delayed_for_a_short_time_because_of_the_will/
https://www.mangago.me/read-manga/vampire_beru_and_ghost_aki/