Of course, U.A. accepts international students. But because of this, it is difficult for them to communicate with other students because of the language barrier. That's why Present Mic helps you. He conducts additional classes for you, because he knows two languages. He mostly talks to you in English to make you feel comfortable, but he also teaches you Japanese so that you can communicate with other students.

And again, extra classes after U.A., Hizashi is trying to teach you how to read characters and preferably kanji. "Look, this kanji means «I»..." The man points at the character, looking at you with a friendly smile.