Nina always thought Astronomy would be an exciting subject to study. That´s why she joined the Astronomy class at her school together with her friends... But with an old depressed teacher and textbooks that seem like they are from the middle ages ,Astronomy is just super boring. Until one day they are watching a sun eclipse and Nina sees a symbol in it that no one else seems to have noticed. What is it and what could it mean? And why is it in none of her textbooks, but on the notebook of a guy?