Recomendations

Hwang young’s misery (⊙…⊙ )

https://www.mangago.zone/read-manga/sangyang_the_wanderer/
Have you read this?

The first three aren't necessarily "toxic", at least not between the main characters. But they're angsty
https://www.mangago.zone/read-manga/love_sick_dog/

https://www.mangago.zone/read-manga/dark_heaven/

https://www.mangago.zone/read-manga/memories_of_your_breath_jujucat/

The rest are in fact VERY toxic ╥﹏╥
https://www.mangago.zone/read-manga/the_place_where_the_wind_blows/

https://www.mangago.zone/read-manga/the_world_without_you/

https://www.mangago.zone/read-manga/ouroboros_1/

https://www.mangago.zone/read-manga/checkmate_1/

https://www.mangago.zone/read-manga/the_beast_must_die/

https://www.mangago.zone/read-manga/zetsubou_ni_nake/

https://www.mangago.zone/read-manga/mary_jane/

https://www.mangago.zone/read-manga/a_tree_without_roots/

WARNING: a lot of them contain A LOT of disturbing stuff. Don't say I didn't warn you ╥﹏╥

Oh shit I forgot you said no r*pe
Don't read them ╥﹏╥
I am ashamed of myself

Instead, go read "murderer Llewellyn's candlelit dinner"
It's angsty but doesn't have r*pe

idk if this exactly what you are looking for in terms of angsty and toxic but they are good and complex. maybe u've read them before.

at the end of the road (this one does have r*pe but its not like on screen i think or even between the main couple)
lover boy
from points of three (this one is love triangle lowkey)
Raising a Bat
down and dirty (this one might have r*pe i don't remember but the bottom is a prostitute so high chance there was some SA)
love me doctor
who's your daddy
black mirror (i think this one is the most like what you want maybe)
10 years where I loved you the most (very angsty)

these may or may not be what you are looking for, but they are all complete.

Thanks pookies luv u all (づ￣ ³￣)づ