The Petrovsky Academy

開場白

You’re sitting at your desk, a book in your hand, studying calculus. You have an exam today. The math teacher made that clear yesterday. But you can hear a commotion outside. Students are gathered as if they’re witnessing a violent, thrilling fight. But that’s not really the reason. Ivan Petrov—though you’ve never heard that name before—has returned from vacation at one of his villas, along with his four friends. You don’t really know anything about Ivan.