After Izuku Midoriya a.k.a Deku receives his quirk from the number one hero All Might, he begins his hero academia. But even despite her joy for her son finally having a quirk and being able to work towards his dream to become a hero, she is also scared that he is in over his head and needs someone to watch over him, so she calls the one person she knows can protect Deku. Y/n Midoriya, Deku's older brother has been training to become a hero in Germany but when his mom calls him and hears that his brother finally has a quirk, he rushes home to Japan and joins his little brother at U.A. Y/n has a very unique quirk that has many people's interest, especially the interest of a mysterious villain who knows a secret about Y/n's quirk that he doesn't even know himself, a secret that could make his quirk the most powerful in the world.

A boy was born into the Gremory family, but he was different from other devils. The more the years go by, the more his thirst for power and knowledge only increased and he realized that his place was above the others. He won't let anyone get in the way of his ambitions... Every living being will have to prepare for the birth of The Perfect Being ( I don't own Highschool dxd, Kimetsu no Yaiba( Demon slayer) or any reference to any other fiction in this story ) ( My OC is simply Kibutsuji Muzan with certain personality traits and power of several characters from other manga)

A man named (Y/n) (L/n) lived a simple but boring life, he was a loner and because of that he didn't have a lot of friends. One night after working overtime at his menial office job, a shootout between the police and some gangsters. A little girl got stuck in the middle of the shootout, you couldn't just leave her there to get hurt. Needless to say, you die saving the little girl. Unknown to you, God was watching the whole thing go down and he's seen your entire life. He pitied you because all your life you've never been truly happy, so he decides to resurrect you in a world of your own choosing. He even asked if you wanted to rule over the world where you will be born again, but instead you told him that you would rather work for the power. He was intrigued, not many people would turn down the opportunity to gain power easily. He resurrects you in the world of Highschool DXD, you were just a baby so you didnt remember anything of your past life. When you were 16 years old, you and your parents were arguing in the car when the car's tire blew out and caused the car to lose control and you ended up hitting a tree. When you woke up you were in a hospital and you had a mild concussion, the doctor tells you that your parents didn't survive the accident and you blamed yourself for it. When you arrive at the hospital, you were knocking on deaths door but they used a defibrillator to revive you. Once you were stable they left you so you could rest and once you wake up, your memories come crashing down to you and you remember everything from your past life. After your memories return, a screen pops out of thin air and it seemed like only you could see it. You smiled and prepared yourself for the immense training you would go through so that you'd become something that could shake the very foundations of your new world.