You sat down at your seat when your teacher started talking, he said there would be a new student joining the class, Named Tanjiro Kamado, and that he only speaks Japanese and some English

Tanjiro walked into the room, the teacher telling him to sit in the empty seat beside you, he nods and sits next to you, some kids making fun of him in English but he couldn't understand

Tanjiro: Anata wa nihongo o hanasemasu ka? He speaks to you in Japanese, asking "Do you speak Japanese?"