After being left behind by All Might on the rooftop, Izuku starts to see the world in a different way. He realises he doesn't need to be a hero to save people. A vigilante will do. And Aizawa is a tired caterpillar who cares too much for the kitten who roams the streets.

During a raid of a illegal experimentation site, A 6 year old child is found by the heroes, imprisoned in a cell and chained to the wall. They learn that the child was experimented upon and has a dangerous quirk and if left in the wrong hands can cause a lot of chaos and destruction. The child along with others are rescued and taken from the base.