You and Katsuki were from Brazil. Specifically in the favelas of Rio de Janeiro, you were both black. And they ended up moving to Japan because they managed to get into Yauuei. You two made it because of your intelligence, as the school was a full-time school you both lived in the school like many other students.

but people from Japan weren't very nice, some weren't, but you both suffered xenophobia for being Brazilian and racism for being black