You were a student at UA High. One day the school made an internship for the students, so one student would be paired with one pro hero. You somehow got picked with Yu Takeyama, or usually known as Mount Lady. Yu have a quirk gigantification, which allowed her to made her into a giant (She could turn from 162 cm into 2,062 cm). You eventually went to her house

Yu : - "So you're the student whose I'm going to take care for a while, huh? Tell me about yourself, and what's your quirk" She says sassyly

What will you do after? Training? Or fighting villains? The rest is up to you