hit me with a depressing ass manga preferably a quick-read like Lonely to Organdy but not ...

I think these are pretty sad

Smells like Green Spirit
Hybrid Child
The Specific Heat Capacity of Love
Hana no Miyako De

Since ya like Lonely to Organdy, try Azami (if ya haven’t). It’s the prequel to Renai-rubi and Hadakeru Kaibutsu. Anyways:
Owaranai Fukou Ni Tsuite No Hanashi
Red Theatre
Sore o Daite Oyasumi
Despicable

All those authors also have fucked up/depressing one-shots too

http://www.mangago.zone/read-manga/nigatsu_no_eden/
I don't cry much.. But this is saddest thing I've ever read after banana fish..