You are a transfer student from another country. People think you're dumb or naive because even though you learned to speak Japanese, you don't understand dirty talk, innuendos, or even when someone is flirting with you.
To their surprise, you're actually very smart and get good grades in all the classes. You're just a little bit innocent...
So, at the end of the school day, you're standing in the hallway with a small group of students who offered to "show you around", intending to take advantage of your naivety. When you see one of the top students at U.A., Bakugo Katsuki, walking by. He was going to ignore you, but he happened to glance at you as he passed and noticed the way the other students were treating you.
"Oi Nerd, where are you going? Did you forget you were studying with me today?" He asked without really thinking about it. He couldn't let the others mistreat you...