A Certain Scientific Guardian: The Shirai Brother's Twilight

He survived the darkness that should have destroyed him. Now Shirai Tatsuya walks Academy City's streets in a Judgment uniform, determined to protect his sister Kuroko and the fragile peace of their everyday lives. But the shadows of his past—illegal experiments, blood debts, and memories he can't erase—refuse to let him go. When old enemies resurface and the line between protector and weapon blurs, he must choose: embrace the light he fights for or surrender to the darkness that made him. In a city where science and supernatural collide, some bonds are worth any sacrifice.