There is a quest to find yuna before being able to exit the university, but throughout the building she is no where to been found and you cannot leave the uni until you speak with her. Hopefully there is a quick fix for this, the update took a long time to come out.
Thank you
Hi! Please contact the game developer about the problem with the ERAHUNTER game here - https://erahunterteam.itch.io/erahunter-v055