Sometime ago, a younger Izuku Midoriya stands up to Katsuki Bakugo in order to defend another child from being bullied. Katsuki doesn't take "Deku" seriously and mocks him for being Quirkless and attempting to play hero. Back to present time, a now 14-year-old Izuku watches as Heroes battle an enormous villain.

One day long ago in Qing Qing City, China, a luminescent baby was born with a unique power. Then, as time passed, the similar phenomena happened all over the world, and soon, the majority of the population had obtained superhuman powers known as "Quirks". Due to that, people were able to pursue heroism as a profession.

As Backdraft keeps citizens at a safe distance, Kamui Woods battles the gigantic criminal. Kamui Woods states that the villain used his Quirk for illegal purposes and uses Lacquered Chain Prison on him in an attempt to stop his movement.

However, Mt. Lady shows up and uses Canyon Cannon to defeat him. Several people start photographing the heroine as she declares that today is her debut and asks for the rest to be left up to her. Izuku starts rapidly taking notes about Mt. Lady's Quirk, Gigantification. A man wonders if he's aiming to be a hero, wishing him good luck, to which Izuku happily answers that he'll do his best.