Reincarnation Manga

A great manga! I seem to have reincarnated in the world of an r-rated romance fantasy novel. And not just as an ordinary character, but as the witch who loses her life to the crazy male lead!
Luckily there is a long 200 years until the main characters are born and grow into their roles.
Now that my life is not in imminent danger, shall we leisurely think of ways to avoid death?
However, I had not taken notice of a very important detail about the time I’d be spending ‘safe from imminent danger’.

WARNING: This gets frustrating after a while because of the amount of tragedy it's not for everyone
Navier was the perfect empress, however, the Emperor wanted a wife, not a colleague. And so, the Emperor abandoned Empress Navier and placed a slave girl beside him. That was fine, until Navier heard the Emperor promise the slave girl the Empress’ position. After much agonizing, Navier decided she would remarry the emperor of the neighboring country.

I absolutely love this one!I confessed. I couldn't do it while sober so I took a shot of liquid courage.
“I like you.”
“Why?”
“I just like everything about you.”
“... I don't understand.”
Something's strange. His voice is deeper, his height slightly different, and his physique even more so. In fact, after a closer look, even the hair colour that reflected the moonlight?—this is crazy. It’s someone else. It's none other than Duke Cabel Willard who's known as the 'Grim Reaper' of the battlefields.

TW: Mentions of suicide and showing of suicide attempt
I have no words for how to describe this other then crazily funny. The characters are super dramatic and stupid really lifting the mood of something with a dark theme definitely worth the read

it was probably one of the best I've read (could just be the tea)
When I opened my eyes I had become the duchess. But something isn’t right. I went as far as becoming a character but I’m just a duchess in name that gets mistreated by the maids and ignored by her husband. What a crappy life! Gosh, I don’t know what to do anymore. I’ll just quietly enjoy my tea, was what I thought. “Can you prepare tea for me again next time?” Something’s gone wrong with my cold husband!

I forgot about this one for a while but when I came back it was like heaven! Leslie’s life was always used for the betterment of her sister, Eli. After a failed attempt to extract the black magic within Leslie to transfer to Eli, Leslie knocks on the door of the monster Duchess and pleads for the Duchess to adopt her?!