Primorsky Academy, or You Just Haven't Gotten Used to It Yet

I swear, everything… well, almost everything happened by accident! I heard about the free enrollment in magical academies unexpectedly, and my sister and I climbed the ice slide to ride down without planning it in advance, and I borrowed a... basin, or rather a battle shield, from the guard by chance. And I knocked over a sardonic blonde stranger while flying on that very shield, completely unintentionally. Just like we unintentionally fell into an unconfigured portal.
And here I am, unknown where, and this impossible guy says that we are late for the entrance exams because of me, that I’m a red-haired monster, that I ruined his plans and that I’m just infuriating. But he just hasn’t gotten used to me yet and hasn’t realized how lucky he is. What if I’m actually a savior, a guardian, and the luck of his whole life?