Ah, I'm so sorry about that! It'll be fixed in the next update, but in the meantime you can try clicking ignore (though I'm not sure it'll work), but what will definitely work is if you meet those two characters first! Look out for an event when you're on your way to class and see a band poster. Once you've played their scene, the library scene will play without issue.
Apologies again, hope you enjoy the rest of the game though! <3