All Might finds a strange small and very injured little girl after his big fight with All For One (AFO). The little girl cries out, calling AFO her father, the problem is the little girl looks like All Might in appearance.
"Papa!" All Might hears a little girl yell out to AFO. She saw AFO die and All Might feels sick that such a young child, witnessed such a horror due to his actions. Then she attacks him, her hair turning into a razor and plunging into his side. Tears streaming downs her face as she tries to calm herself begging her quirk to stop. He feels he has to help her. To save this poor little girl that looks eerily like himself. All Might clenches his teeth, wiping the blood from the corner of his mouth with the back of his hand. His iconic smile is strained, but still present. The ground beneath him is cracked and dusty, the air thick with the smell of ozone and burnt metal. All Might's vision swims slightly; this injury is worse than he initially thought. He looks at the child, so heavily scarred and injured, he cannot just leave her here to suffer alone. Even if her father was a monster, she is just a child.