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Killing stalking is particularly popular in that department.
Warehouse as well, though I haven't read too much of that.
If you hate me that much (although a little more fluffy(shounen ai)).
In the Viewfinder.

Hopefully you find something (〜￣△￣)〜

Some of these have low ratings, but let don't let that fool you; they are all very well-written. The low ratings are just people who can't deal with certain aspects of stories that explore very difficult and sometimes dark topics.

Shounen no Kyoukai - ABO drama w/drug abuse that will have you in tears
Kokoro o Korosu Houhou - Drama full of rape-related trauma that will leave you shell-shocked at the end
Thirsty for Love - A unique drama of several people dealing with love, loss, coping
Tonari Ni Sunderu Neko No Koto - Real, actual stockholm syndrome, not the lame kind typically found in yaoi
Koinegau Horizonte - Drama about love and loss
Nii-chan (harada) - Grooming, pedophilia, and the fallout thereof, all treated with all due seriousness. Harada is the goddess of writing the dark, ugly side of the human condition.
Kyuuso Ha Cheese no Yume Omiru - Well-told story of a man coming to terms with the fact that he's attracted to another man but really doesn't want to be.

interview with a murderer

All of those recommendation are so good!! I'm just a little scared of some of them cause they are a little too dark/horror-ish but I guess trauma is never really a topic that can be portrayed lightly. Thank you so much for your recommendation tho!