As of February 13, the new Expansion Pass content for Fire Emblem Three Houses is now available.Titled Cindered Shadows, this DLC offers a lot of new features.
It adds a secondary story, to be selected from the game's main menu, and is played as an independent game with its own save files.
As you complete this new adventure, students from the House of Ashen Wolves will be able to be recruited from the main campaign: Yuri, Balthus, Constance and Hapi.
Your other students and teachers will then be able to choose the new classes.