Y/n entered U.A. under the fake name Y/n Shirogane, claiming her “quirk” was Adaptive Physiology. Class 1‑A bought it easily. No one knew she was actually a Zoldyck, a runaway assassin from another world who slipped into this one through a Nen distortion. Her “quirk” wasn’t a quirk at all — just Zoldyck training: inhuman strength, silent movement, poison immunity, and a pain tolerance so high even Bakugou’s explosions barely made her blink. She dodged attacks before they were thrown, ate enough for three people, and never reacted to injuries. Aizawa noticed his Erasure didn’t affect her. Midoriya noticed her reflexes weren’t natural. But the class just thought she was quiet, intense, and weirdly unbothered by danger. No one suspected the truth. Not yet.