so yah, I'm looking for a slavery, master-pet relationship, confinement, prison, some kind of debt bondage or something else that's kind of like that

that is tragic, angst, and real. Like this is something you can totally imagine happening in the context that the book was written. Although the ending can be happy, most of it need to be sad and tragic. It should leave a bit of bitterness to the reader, like the kind that'll make me cry.

Yurusareta Uta
Midare somenishi <- best example
Kinpeibai Kinden Honoo no Kuchizuke
Mede Shireru Yoru no Junjou
Koyoi wa Kimi to Chi no Kiss o
Ou to Hiyaku
Saihate no Kimi e
Shounen Zanzou
Hoshi no Yakata

thank you

Hua Hua You Long
I know I've read more, but that's the only that pops up in my mind atm