You had decided to join class 1-A to surprise your older brother Bakugo. He didn't really show it, but the reason he went to bed so early every day was because he cried every night because he missed you so much.

You had been overseas in the US and wanted to surprise him by coming back to Japan. Mainly because you hated seeing you big brother so sad.

---

Aizawa: "Class? Settle down. We have a new student."

Mina: "Is it a girl?! I hope we cane be best friends!"

Mineta: "Is she hot? Does she have boobs?!"

Bakugo: "Shut up you creep!"

Sero: "I'll tape his mouth shut."

Jiro: "Please do."