this is a fic where kiyotaka ayanokoji escapes the white room and goes to Chidori Public High School for a low key peaceful life and thats where he meats her (no lemon you monster)

After being reborn in a world dominated by colossal walls and dark secrets, Kiyotaka Ackerman, now Mikasa's younger brother, faces his new life with the same cold and calculating demeanor that defined him in the past. While concealing his intellect and superhuman strength, Kiyotaka quietly observes the fragile balance of humanity within the walls, preparing himself to face the destiny that threatens to destroy everything.

Since the day he was created he was never going to be promised a normal life. Raised unlike other children, he never had a good grasp on his own emotions. Despite that, he still chose to use his abilities for the sake of others, even if it put his life on the line time after time. Was it duty or spirit that motivated his actions?

"In this world, strength is not measured by muscle, but by the ability to bend reality to your will." Ayanokoji Kiyotaka, the masterpiece of the White Room, desired only a peaceful and mediocre life at the Advanced Nurturing High School. Sakayanagi Arisu, the director's genius daughter, desired only one thing: to destroy her father's artificial creation and prove that true genius is innate. But the school's chessboard became too small for both of them. When an anonymous challenge interrupts their private match in the library, they defeat a God at his own game and are cast into Disboard - a world where violence is forbidden by the Ten Covenants and everything, from national borders to people's lives, is decided by games. For Arisu, this world is paradise: a place where her frail legs do not matter and her sadistic mind is the ultimate weapon. For Kiyotaka, it is the ultimate laboratory: a controlled environment where he can test the limits of human manipulation without the constraints of modern society. They are not siblings bound by blind trust like the legendary "Blank". They are predators bound by mutual obsession. As they ascend to the throne of humanity, the dynamic between them shifts. Cold rivalry gives way to a dangerous and calculated intimacy. In a world where betting one's life is routine, Ayanokoji and Sakayanagi will discover that the riskiest game of all is not against the other races or the One True God Tet, but against each other - in a game of seduction and control where the first to fall in love loses. They didn't come to save humanity. They came to rule it. (Arisu x Kiyotaka, no harem)

From the sterile walls of the White Room to the chaotic depths of the Ark. Kiyotaka Ayanokoji never expected to wake up in a world on the brink of extinction. Yet, as he opens his eyes in the wreckage of a transport, he isn't confused. He recognizes the Raptures. He recognizes the gun in his hand. And most importantly, he recognizes the artificial girl saving his life. Thanks to the idle ramblings of a former classmate named Sotomura, Kiyotaka knows this world. He knows the "Goddess of Victory: NIKKE." He knows the tragedies awaiting Marian, Rapi, and the others. He knows the corrupt politics of the Central Government. But Kiyotaka is not the Commander from the story. He is the Masterpiece of the White Room. Viewing the war against the Raptures not as a crusade, but as a complex chessboard, Kiyotaka decides to pursue a variable that the original story lacked: A true happy ending. With absolute knowledge of future events and an intellect bred for supremacy, he will build the ultimate Outpost. He will turn weapons into loyal lovers. He will rewrite the timeline. This is not a story of survival. It is a story of optimization. [Crossover: Cote x NIKKE] [Harem] [Slow Burn] [Explicit Content/R-18] [Smart Protagonist]