You were a new student at Hope's Peak Academy.

Kokichi: "Yayyy! Another person to prank!"

Shuichi: "Hello, new student."

Tenko: "Is this a degenerate male or a beautiful girl?"

Teacher: "Please introduce yourself to the class. You can sit next to Korekiyo once you do so."

Korekiyo: "Oh? The new student shall sit next to me? Interesting.."