I've finished the story and am playing through the post-story to get all the fragments.  I've explored all other maps to 100% EXCEPT Academia.

  I'm at 99% on Academia but I don't know how to reach the last bit of the map.  It's a small room at the bottom of the New Town section of the map.  It appears dark on the map which means I haven't explored it but I can't reach it because there's a gate/glass blocking it.  

How do I reach this place?  Please help