Uraraka mysteriously develops a new quirk to grow massive in size, the same to that of Mt Lady. But this quickly becomes an inconvenience to her as she is yet to properly control her new growing ability, putting the city at risk of her own destruction. Luckily Deku is nearby to investigate the situation.
After losing control of both her gravity manipulation and new size quirk, Deku arrives in time to save Uraraka (and both thousands of people inside an office building) from destruction! But it looks as though Deku wasn't able to save at least one person in this situation, himself. (Nah he'll be fine.)