How Can A Demon Slayer OC Fit Into The Original Storyline?

accept each other?He was born as the ruler of their world. She was born...to slay that world. He wanted to kill her the moment he saw her. She wished...he wouldn't even find her. Amidst all the chaos, adventures and secrets, will they accept each other?

Sinora learned early that survival meant obedience. For several years, she endured humiliation, violence, and betrayal at the hands of her foster family and the Belmont family—the elite dynasty that owned her loyalty, her love, and her silence. She was a fiancée in name, a servant in truth, and a woman erased for the comfort of others. When their cruelty leaves her fighting for her life, Sinora wakes with a vow — she would Live this time. Sold into marriage to Cassian Blackwood, the cold and infamous heir of a criminal empire, Sinora expects another cage, but prepares to fight back. However, what she finds instead is a man as ruthless as he is unreadable, in a world where power is taken, not given, and loyalty is a valuable currency. His family, surprisingly accepts her like family. Cassian expects a broken, obedient wife. Instead, he gets a woman who has been to hell, and whose life is about to change on a totally different level. When the dying patriarch of the Belmont family leaves Sinora a shocking share of their empire, the Belmonts turn on her and the Blackwood family, reeling in enemies from all around, and a decades-old crime begins to surface. A dead man’s switch unleashes secrets that ignite wars between elite families and criminal syndicates. Assassinations, betrayals, and hidden bloodlines threaten to destroy everything. They chase after Sin as if she holds the key to their very destruction. Pulled between her abusive ex fiancé and the dangerous husband who awakens something dark and intoxicating in her, Sinora must decide who she will become in a world that only respects monsters. Because her birth was a crime, and her existence is a threat, Sinora must do everything to find the truth and survive.

Lyon Aschere, well-known as "The Reaper" is the youngest person to be an official Royal Knight of Avaritia and is also the personal Knight of King Charles Avaritia II eldest daughter Princess Jiniya Avaritia. But with him being a lowly commoner with high aptitude for magic and martial arts his status as a Royal Knight was hidden from the public. A few weeks after being appointed as a royal knight his left eye began to ache, showing him disturbing images, thinking that it was only a matter of hallucinations he disregarded it. Until the Princess found out about his problem, the princess being kind to her childhood friend, decides to help him figure out what is happening to his eye, venturing out to different Kingdoms looking for answers. But to their surprise the world was riddled with secrets that dated back from thousands of years. The story follows Lyon and Jiniya as they try to understand what powers lie behind Lyon's eye.

In an attempt to summon a strong familiar, Rubisviel Fyaril, Witch of The Dark Forest, created a spell to bring forth an otherworldly entity only to end up summoning a Demon Prince with no memories of his past. She managed to convince the demon to leave however they parted after he gave her an oddly familiar kiss. When she finally thought that her life was going back to its witchy normality, her visitor returned only to claim that he's going to reside with her due to a master-servant curse that bound them on his summoning. Ruby was forced to live with a very flirtatious demon who seemed to want to bed her so she tried finding a way to break their curse. But what if his presence only attracts trouble? And what if he's actually part of the past she wanted to forget? Watch out little witch you're not the only one brewing evil in her pot. A Demon Queen you've once vanquished is rising from her grave to get back to you and when she does you better sharpen your weapons and kiss your demon for the long nights about to come.

The day before our wedding, I received an expensive suit from my wife. Not long after, her young lover called me, his voice trembling. "I'm sorry. It was my fault. My bad for mixing up your size. Please… please don't blame Sylvie." On the other end, I could hear Sylvie soothing him gently, patiently, until he calmed down. I stared at the plane ticket in my hand—a one-way trip out of the country—and calmly asked her for a divorce. Then, as if I no longer mattered, she left me with a single, cold sentence. "Just don't regret it."

The odds are stacked against her--just how she like it.... After the Revelation, when Vampires around the world came forward and disclosed themselves to the world, the Hunters and Guardians that had fought in the shadows to defend humanity were also exposed—and hunted down, enslaved, destroyed, and sent into hiding. Jo McReynolds, the daughter of the most powerful Vampire Hunter to ever live, continues to slay bloodsuckers in the night. After the mysterious disappearance of her mother and a series of conflicts with the rest of her family, Jo is out on her own, and that’s fine with her. Because she doesn’t need anyone but herself. But the others need her. When her team gets a tip as to the whereabouts of the Vampire responsible for the disappearance of Jo’s mom, her family wants her back. No one can kill bloodsuckers like Jo McReynolds. Saying she’s sorry and coming back to the fold will be difficult, and she’s not sure she even wants to go—but finding this Vampire might reveal what really happened to her mother, so Jo accepts. With Jo as part of the team, can they track down the Vampire and discover what happened to her mother? Is it possible to rid the earth of Vampires once and for all and restore the Hunters and Guardians to their former glory—or will Jo and her team end up captured or destroyed like so many of their colleagues?