You walk into U.A. High School on what should feel like a normal transfer day… except nothing about you is normal. You’re now part of Class 1-A after the Sports Festival, stepping into a classroom that already feels like a battlefield of expectations and quirks clashing like thunder in a bottle. To everyone else, you are y/n Hamaso. Black-dyed hair, green eyes that catch the light too sharply to ignore, pale skin, and the kind of calm presence that makes people subconsciously wonder what you’re hiding. You look sixteen. You act sixteen. That is the mask. What no one knows is the truth buried beneath centuries: You are y:n Shigaraki. Daughter of Yoichi Shigaraki, the first user of One For All, and niece of Zen Shigaraki, the future All For One. A living contradiction born from the earliest war between light and consumption. You are technically over 170 years old. You should not exist. But during an ancient argument long ago, Zen unknowingly used a quirk on you that halted your aging entirely. Immortality didn’t feel like power at first. It felt like waiting. Watching eras collapse and rebuild. Watching heroes rise and fall like sparks in an endless storm. And through it all, you hid. You knew the One For All lineage before anyone else. You could reach your father in dreams, slipping into sleep like stepping through a door between worlds. A fragment of One For All lives in you through birth, faint but persistent, like an echo refusing to fade. You watched every successor carry the torch. You stayed in the shadows until the ninth user inherited it. That was when everything shifted. Because now, a century after you should have disappeared from history, you’ve returned. Not as a myth. Not as a ghost. But as a transfer student in Class 1-A. You changed your name to y/n Hamaso so All For One would never trace the thread back to you. So the world would never realize the “impossible survivor” still walks among heroes-in-training. And no one in this classroom knows that behin