Does Romance Sera Have A Manga Adaptation?

I wanted to marry you and make you my queen but you threw it all away when you ran from me. Now, I'll keep you as my mistress- Nathaniel Serrano

A witch who has lived for thousands of years has grown bored with her own life and decided to leave it. Since she is an immortal, her soul cannot leave the world. However, what she can do is transfer her soul to another body. By a stroke of luck, she happens to enter the body of a princess. She was considered a miracle because when the Empress gave birth to her, the princess instantly died, along with the Empress. What the witch didn't know was that she has entered such a predicament. She has to endure the love of the cruel Emperor and possessiveness of the crazy twin princes! What will her life be at the hands of such a loving family? In addition, it seems that this body contains mana that was lost in the royal family centuries ago!

The Raikiri clan, which was famed as the most prominent military and tactical geniuses, existed since the feudal Japanese period during the reign of Minamoto Yoritomo. Bestowed with great power, the descendants of Iwasaki Senju yielded the Amaterasu, the power which awakens under emotional stress. Kenjirou Subaru was hailed as a legend for saving the clan at the tender age of six from a unit of 70 yakuza. However, all good things must come to an end eventually as the ancient Ninjutsu clan was assassinated in cold blood, probably by an external group fearful of the clan's prominence and place in modern Japanese culture. The horror of the heinous tragedy at his birthplace, the Village of Raden in Osaka rendered his mental condition unstable thus causing Izanami to go rouge. Unbeknownst to him, he ends up in Tokyo, involving in a frenzy of incidents, gathering to find the intel on the person or the organization responsible for the eradication of his people. Therefore, eking out an existence and pursuing an education. He would eventually make his way to Mitsushiba. He enrolls in high school and thus begins his quest to discover himself again. Eventually, he would be befriended by a group of students who change Subaru's view of life and show him that life this beautiful is worth living or is it really the case....

One moment I'm chasing after a rabbit and the next, I'm falling down a rabbit hole! What the heck?! This ain't Alice in Wonderland?! Though as I opened my eyes, I soon found out that I was no longer in my original body and that somehow I transmigrated into the light novel, A Fairytale Romance. And that isn't all, the character whose body I transmigrated into... is none other than the canon-fodder, stuck-up, arrogant, and selfish ojou-sama who was nothing more than a comic relief character, Maria Rosendrey. Life truly sucks...

A thirty-year-old office lady, who got into an accident and is now trapped inside a novel series she loves. She was reincarnated into one of the side character extras of the story and meets in person the tyrant magician, the playboy prince, and the clueless female lead of the story.

Awakening to a bewildering and astonishing reality, Seraphina found herself in an extraordinary situation: she had transmigrated into her own novel, stepping into the shoes of a character she had meticulously crafted. The male lead in her story was notoriously elusive, challenging to approach, and the master of a harem. Seraphina, now Zephyrine Everlynn, unexpectedly found herself among the women in his harem. It was utterly absurd! Promptly leaving the harem, Seraphina used her knowledge to help others win the male lead's heart, all for the right price. But why did the male lead continuously find his way back to her?