Gravity Rush and Crisis Core
Maybe MGS2 if it wasn't a terrible game. Possibly the best story in a game in history but one of the worstest games.
Crisis Core is maybe too long I guess.
But wait. Wait wait wait. games should NOT be studied in the classroom. Hell no. Classes should be for practical or utilitarian knowledge only. And for the record the same applies to books and movies. They don't belong in study. Books are only remotely justifiable since they promote reading skills, so at least you're killing two birds with one stone.