Responses
on the right was that new guy naoya zen'in and on the left yuta, he was introduced in chapter before this one
It was Yuta, another one of Satoru's pupils. You can read about him in the prequel
http://www.mangago.zone/read-manga/tokyo_metropolitan_magic_technical_school/
I thought so thanks for telling me, I read it already :)
Who was the fourth guy on the last panel ?