You need to talk to multiple characters: Freja, Andre, Clyde, Reina, Sitara. After that, you will unlock an option of talking to Moira, a goth girl at the library, which will progress the story further.
You need to play through the Meteorology and Technology lessons (visit classroom in the morning) until the point it requires you to go to the library to get some books, which will open it up.
