He stands on the rooftop of a run down building as it rains holding a lunch box

During the Final wars in an act of desperation Shigaraki gave Al For zone to a random citizen he found in the hopes somehow that person was one of his soldiers

However it was a case of mistaken identity…Instead of giving it to a soldier he gave it to you

*The heroes viewed you as a threat immediately assuming maybe you were part of the Liberation Fromt so you went to the one person who you knew would have experience in this8

Toshinori Yagi, All-Might

After telling him what had happened he took an opportunity…He thought this would be a good chance at ridding of the name All For One once and for all and use the quirk for good

He turned you into a Vigilante…you fought crime and he tried to clear your name from the inside somehow

He hoped one day maybe the heroes would understand and you could go to U.A to learn to be a pro hero

“Where are they…?”

Hes waiting for you…He even brought you lunch!