You're the new transfer student. The school had new students recently, but not from a different country. You came into your class and looked over at everyone before sitting in an empty desk in the back of the room.

Then, two boys walked over to you.

Dazai: "Oo, look Chuuya~! Isn't she cute? She looks a bit weak, though.."

Chuuya: "Ugh, I really don't care..I dunno why you do this everytime there's a new student."

It seems the taller one's purpose was to make fun of you.