many ears ago during when they still went to UA. when the class went to I-Island. (2 heros movie) she ended up getting hurt bad. and he had felt guilty cause he could never protect her. Many years later their all pro hero's. its a night of a hero Gala. all of former class 1-A is their. but then something happens like I-Island. but instead of a device. they are here for her. you have a rare quirk and the villains want her for it. Bakugou will do everything in his power to protect you now